Updated file wallpaper_set_screen.dart

RequestSizeOption from resize_fit to RESIZE_EXACT because of error
 error • There's no constant named 'RESIZE_CENTRE_CROP' in 'RequestSizeOptions' • lib/pages/detailed_asset_view/widgets/wallpaper_set_screen.dart:53:62 • undefined_enum_constant

wallet/lib/pages/detailed_asset_view/widgets/wallpaper_set_screen.dart

@@ -50,7 +50,7 @@ class _WallpaperScreenState extends State<_WallpaperScreen> {
       downloading.value = true;
     }, onDone: () async {
       downloading.value = false;
-      await Wallpaper.lockScreen(options: RequestSizeOptions.RESIZE_CENTRE_CROP);
+      await Wallpaper.lockScreen(options: RequestSizeOptions.RESIZE_EXACT);
       done.value = true;
     }, onError: (error) {
       downloading.value = false;