Fix backup not resuming after closed and reopen (#266)

* Fixed app not resuming backup after closing and reopening the app

* Fixed cosmetic effect of backup button doesn't change state right away after pressing start backup

* Fixed grammar

* Fixed deep copy problem that cause incorrect asset count when backing up

* Format code

mobile/lib/modules/home/ui/image_grid.dart

@@ -33,7 +33,10 @@ class ImageGrid extends ConsumerWidget {
                         child: Row(
                           children: [
                             Text(
-                              assetGroup[index].duration.toString().substring(0, 7),
+                              assetGroup[index]
+                                  .duration
+                                  .toString()
+                                  .substring(0, 7),
                               style: const TextStyle(
                                 color: Colors.white,
                                 fontSize: 10,