App: Use a provider consumer

I'm hoping with this if any value in the repo changes it will result in
a rubuild of the entire subtree, so this way I can change the entire
NotesFolderFS easily.

lib/app.dart

@@ -49,13 +49,15 @@ class JournalApp extends StatefulWidget {
 
     Widget app = ChangeNotifierProvider.value(
       value: repo,
-      child: ChangeNotifierProvider.value(
+      child: Consumer<Repository>(
+        builder: (_, repo, __) => ChangeNotifierProvider.value(
           value: repo.settings,
           child: ChangeNotifierProvider.value(
             child: JournalApp(),
             value: repo.notesFolder,
           ),
         ),
+      ),
     );
 
     app = ChangeNotifierProvider.value(