Fix #33168: collada export added incorrect -material postfix to material names.

In the bug report it was also mentioned that special characters should be
preserved for names, however the collada 1.4 specification does not allow this.
Version 1.5 does, but we are still writing 1.4 files and files with such special
characters will then fail to open in some applications.

source/blender/collada/MaterialExporter.cpp

@@ -70,7 +70,7 @@ void MaterialsExporter::operator()(Material *ma, Object *ob)
 {
 	std::string name(id_name(ma));
 
-	openMaterial(get_material_id(ma), get_material_id(ma));
+	openMaterial(get_material_id(ma), translate_id(name));
 
 	std::string efid = translate_id(name) + "-effect";
 	addInstanceEffect(COLLADASW::URI(COLLADABU::Utils::EMPTY_STRING, efid));