UI: Avoid calling obs_source_update multiple times

When we added undo/redo in 86eb7aeb a distinction between Updates and
Visual updates was made, presumably for filters which need special
handling of the update case. These functions were also added to regular
source properties, but didnt use any special code instead calling
obs_source_update an additional time after a short time.

Instead lets remove the 2nd delayed call and only call obs_source_update
once per settings change.

UI/window-basic-properties.cpp

@@ -86,20 +86,10 @@ OBSBasicProperties::OBSBasicProperties(QWidget *parent, OBSSource source_)
 	OBSDataAutoRelease nd_settings = obs_source_get_settings(source);
 	obs_data_apply(oldSettings, nd_settings);
 
-	auto handle_memory = [](void *vp, obs_data_t *old_settings,
-				obs_data_t *new_settings) {
-		obs_source_t *source = reinterpret_cast<obs_source_t *>(vp);
-
-		obs_source_update(source, new_settings);
-
-		UNUSED_PARAMETER(old_settings);
-		UNUSED_PARAMETER(vp);
-	};
-
 	view = new OBSPropertiesView(
 		nd_settings.Get(), source,
 		(PropertiesReloadCallback)obs_source_properties,
-		(PropertiesUpdateCallback)handle_memory,
+		(PropertiesUpdateCallback) nullptr, // No special handling required for undo/redo
 		(PropertiesVisualUpdateCb)obs_source_update);
 	view->setMinimumHeight(150);