fix(StoreSyncService): set flag bug when register IPC handler (#5715)

fix: register IPC handler in StoreSyncService

src/main/services/StoreSyncService.ts

@@ -78,6 +78,8 @@ export class StoreSyncService {
       // Broadcast the action to all other windows
       this.broadcastToOtherWindows(sourceWindowId, action)
     })
+
+    this.isIpcHandlerRegistered = true
   }
 
   /**