Optimize iOS full-screen back gesture implementation (#643)

* Optimize iOS full-screen back gesture implementation

- Fix #613 and #617

* Fix setting page

lib/foundation/local.dart

@@ -153,9 +153,7 @@ class LocalComic with HistoryMixin implements Comic {
             ),
         author: subtitle,
         tags: tags,
-      ),
-      enableIOSGesture: false,
-      iosFullScreenGesture: false,
+      )
     );
   }