Remove unnecessary "Percent" group in ProgressBar

scene/gui/progress_bar.cpp

@@ -100,7 +100,7 @@ bool ProgressBar::is_percent_visible() const {
 void ProgressBar::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_percent_visible", "visible"), &ProgressBar::set_percent_visible);
 	ClassDB::bind_method(D_METHOD("is_percent_visible"), &ProgressBar::is_percent_visible);
-	ADD_GROUP("Percent", "percent_");
+
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "percent_visible"), "set_percent_visible", "is_percent_visible");
 }