Make orthogonal view mode persistent in new scene

Fixes #36339.

editor/plugins/spatial_editor_plugin.cpp

@@ -2147,6 +2147,8 @@ void SpatialEditorViewport::_notification(int p_what) {
 		set_process(visible);
 
 		if (visible) {
+			orthogonal = view_menu->get_popup()->is_item_checked(view_menu->get_popup()->get_item_index(VIEW_ORTHOGONAL));
+			_update_name();
 			_update_camera(0);
 		} else {
 			set_freelook_active(false);