Adds default directory for default_project_path

editor/editor_settings.cpp

@@ -591,7 +591,7 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 
 	set("filesystem/directories/autoscan_project_path", "");
 	hints["filesystem/directories/autoscan_project_path"] = PropertyInfo(Variant::STRING, "filesystem/directories/autoscan_project_path", PROPERTY_HINT_GLOBAL_DIR);
-	set("filesystem/directories/default_project_path", "");
+	set("filesystem/directories/default_project_path", OS::get_singleton()->has_environment("HOME") ? OS::get_singleton()->get_environment("HOME") : OS::get_singleton()->get_system_dir(OS::SYSTEM_DIR_DOCUMENTS));
 	hints["filesystem/directories/default_project_path"] = PropertyInfo(Variant::STRING, "filesystem/directories/default_project_path", PROPERTY_HINT_GLOBAL_DIR);
 	set("filesystem/directories/default_project_export_path", "");
 	hints["global/default_project_export_path"] = PropertyInfo(Variant::STRING, "global/default_project_export_path", PROPERTY_HINT_GLOBAL_DIR);