Remove unused Optimize Mesh import option from OBJ mesh import

This option was enabled by default, but it did nothing regardless
of whether it was enabled or not.

doc/classes/ResourceImporterOBJ.xml

@@ -21,9 +21,6 @@
 		<member name="offset_mesh" type="Vector3" setter="" getter="" default="Vector3(0, 0, 0)">
 			Offsets the mesh's data by the specified value. This can be used to work around misaligned meshes without having to modify the source file.
 		</member>
-		<member name="optimize_mesh" type="bool" setter="" getter="" default="true">
-			Unused parameter. This currently has no effect.
-		</member>
 		<member name="scale_mesh" type="Vector3" setter="" getter="" default="Vector3(1, 1, 1)">
 			Scales the mesh's data by the specified value. This can be used to work around misscaled meshes without having to modify the source file.
 		</member>

editor/import/3d/resource_importer_obj.cpp

@@ -202,7 +202,7 @@ static Error _parse_material_library(const String &p_path, HashMap<String, Ref<S
 	return OK;
 }
 
-static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes, bool p_single_mesh, bool p_generate_tangents, bool p_optimize, Vector3 p_scale_mesh, Vector3 p_offset_mesh, bool p_disable_compression, List<String> *r_missing_deps) {
+static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes, bool p_single_mesh, bool p_generate_tangents, Vector3 p_scale_mesh, Vector3 p_offset_mesh, bool p_disable_compression, List<String> *r_missing_deps) {
 	Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
 	ERR_FAIL_COND_V_MSG(f.is_null(), ERR_CANT_OPEN, vformat("Couldn't open OBJ file '%s', it may not exist or not be readable.", p_path));
 
@@ -507,7 +507,7 @@ static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes,
 Node *EditorOBJImporter::import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps, Error *r_err) {
 	List<Ref<ImporterMesh>> meshes;
 
-	Error err = _parse_obj(p_path, meshes, false, p_flags & IMPORT_GENERATE_TANGENT_ARRAYS, false, Vector3(1, 1, 1), Vector3(0, 0, 0), p_flags & IMPORT_FORCE_DISABLE_MESH_COMPRESSION, r_missing_deps);
+	Error err = _parse_obj(p_path, meshes, false, p_flags & IMPORT_GENERATE_TANGENT_ARRAYS, Vector3(1, 1, 1), Vector3(0, 0, 0), p_flags & IMPORT_FORCE_DISABLE_MESH_COMPRESSION, r_missing_deps);
 
 	if (err != OK) {
 		if (r_err) {
@@ -578,7 +578,6 @@ void ResourceImporterOBJ::get_import_options(const String &p_path, List<ImportOp
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "generate_tangents"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "scale_mesh"), Vector3(1, 1, 1)));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "offset_mesh"), Vector3(0, 0, 0)));
-	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "optimize_mesh"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "force_disable_mesh_compression"), false));
 }
 
@@ -589,7 +588,7 @@ bool ResourceImporterOBJ::get_option_visibility(const String &p_path, const Stri
 Error ResourceImporterOBJ::import(const String &p_source_file, const String &p_save_path, const HashMap<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files, Variant *r_metadata) {
 	List<Ref<ImporterMesh>> meshes;
 
-	Error err = _parse_obj(p_source_file, meshes, true, p_options["generate_tangents"], p_options["optimize_mesh"], p_options["scale_mesh"], p_options["offset_mesh"], p_options["force_disable_mesh_compression"], nullptr);
+	Error err = _parse_obj(p_source_file, meshes, true, p_options["generate_tangents"], p_options["scale_mesh"], p_options["offset_mesh"], p_options["force_disable_mesh_compression"], nullptr);
 
 	ERR_FAIL_COND_V(err != OK, err);
 	ERR_FAIL_COND_V(meshes.size() != 1, ERR_BUG);