Fix the channels gltf importer uses for metallic and AO textures.

Khronos blender gltf exporter uses red channel for occlusion and blue channel for metallic, whereas the current behavior is the opposite.

Fixes #10700.

editor/import/editor_scene_importer_gltf.cpp

@@ -1216,7 +1216,7 @@ Error EditorSceneImporterGLTF::_parse_materials(GLTFState &state) {
 				if (bct.has("index")) {
 					Ref<Texture> t = _get_texture(state, bct["index"]);
 					material->set_texture(SpatialMaterial::TEXTURE_METALLIC, t);
-					material->set_metallic_texture_channel(SpatialMaterial::TEXTURE_CHANNEL_RED);
+					material->set_metallic_texture_channel(SpatialMaterial::TEXTURE_CHANNEL_BLUE);
 					material->set_texture(SpatialMaterial::TEXTURE_ROUGHNESS, t);
 					material->set_roughness_texture_channel(SpatialMaterial::TEXTURE_CHANNEL_GREEN);
 					if (!mr.has("metallicFactor")) {
@@ -1243,6 +1243,7 @@ Error EditorSceneImporterGLTF::_parse_materials(GLTFState &state) {
 			Dictionary bct = d["occlusionTexture"];
 			if (bct.has("index")) {
 				material->set_texture(SpatialMaterial::TEXTURE_AMBIENT_OCCLUSION, _get_texture(state, bct["index"]));
+				material->set_ao_texture_channel(SpatialMaterial::TEXTURE_CHANNEL_RED);
 				material->set_feature(SpatialMaterial::FEATURE_AMBIENT_OCCLUSION, true);
 			}
 		}