fix(ui): sync $isStaging on staging area module init

Fixes a case where the canvas is erroneously interactable after refreshing the page while currently staging.

invokeai/frontend/web/src/features/controlLayers/konva/CanvasStagingAreaModule.ts

@@ -62,6 +62,7 @@ export class CanvasStagingAreaModule extends CanvasModuleBase {
   initialize = () => {
     this.log.debug('Initializing module');
     this.render();
+    this.$isStaging.set(this.manager.stateApi.runSelector(selectIsStaging));
   };
 
   render = async () => {