Fix getting properties state when reloading C#

When reloading C# classes and keep their properties values they are
retrieved and stored in a state list.
Retrieving the properties was only getting the fields of the C# class
and not inherited fields so those properties values were lost on reload.
Now we also try to find the field in the parent classes.

modules/mono/csharp_script.cpp

@@ -1570,9 +1570,19 @@ void CSharpInstance::get_properties_state_for_reloading(List<Pair<StringName, Va
 
 		ManagedType managedType;
 
-		GDMonoField *field = script->script_class->get_field(state_pair.first);
-		if (!field)
+		GDMonoField *field = nullptr;
+		GDMonoClass *top = script->script_class;
+		while (top && top != script->native) {
+			field = top->get_field(state_pair.first);
+			if (field) {
+				break;
+			}
+
+			top = top->get_parent_class();
+		}
+		if (!field) {
 			continue; // Properties ignored. We get the property baking fields instead.
+		}
 
 		managedType = field->get_type();