Start with a idle state

Not sure why it was true - there is a possibility that this was intentional, but
I can't think why. The reason for changing it is to fix our "isForced" logic
(otherwise the non-file-related sync doesn't run on app start), without
introducing _another_ flag to track if the sync was initiated from a gallery
useEffect or by the preUploadSync.

web/apps/photos/src/pages/gallery.tsx

@@ -255,7 +255,7 @@ export default function Gallery() {
         accept: ".zip",
     });
 
-    const syncInProgress = useRef(true);
+    const syncInProgress = useRef(false);
     const syncInterval = useRef<NodeJS.Timeout>();
     const resync = useRef<{ force: boolean; silent: boolean }>();