Fix editor screen shouldn't allow going home while submitting.

lib/screens/editor.dart

@@ -310,8 +310,11 @@ class _EditorScreenState extends State<EditorScreen> {
 
     return Scaffold(
       appBar: StandardAppBar.build(
-          context, widget.id.isEmpty ? 'New $statusType' : 'Edit $statusType',
-          withDrawer: true),
+        context,
+        widget.id.isEmpty ? 'New $statusType' : 'Edit $statusType',
+        withDrawer: true,
+        withHome: !isSubmitting,
+      ),
       body: body,
     );
   }