Increase the default texel size for lightmap baking

This has several benefits:

- Baking is now significantly faster out of the box (often twice as fast).
- Lightmap texture file sizes are often divided by 2 or 3.
- Baking requires less memory and is less likely to crash on large scenes.

Visual quality may be degraded, but it's usually not very noticeable
in the default configuration where only indirect lighting is baked.

editor/import/resource_importer_scene.cpp

@@ -1542,7 +1542,7 @@ void ResourceImporterScene::get_import_options(const String &p_path, List<Import
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "meshes/generate_lods"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "meshes/create_shadow_meshes"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "meshes/light_baking", PROPERTY_HINT_ENUM, "Disabled,Static (VoxelGI/SDFGI),Static Lightmaps (VoxelGI/SDFGI/LightmapGI),Dynamic (VoxelGI only)", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 1));
-	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "meshes/lightmap_texel_size", PROPERTY_HINT_RANGE, "0.001,100,0.001"), 0.1));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "meshes/lightmap_texel_size", PROPERTY_HINT_RANGE, "0.001,100,0.001"), 0.2));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "skins/use_named_skins"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/import"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "animation/fps", PROPERTY_HINT_RANGE, "1,120,1"), 30));