fix keyboardHeight

packages/zefyr/lib/src/widgets/toolbar.dart

@@ -387,7 +387,7 @@ class ZefyrToolbarState extends State<ZefyrToolbar>
     } else {
       layers.add(
         Container(
-          height: 0,
+          height: MediaQuery.of(context).viewInsets.bottom,
         ),
       );
     }