Simplify the code

Now the Note's modified/created can never have a date with a year = 10
meaning a special thing.

Author: vHanda

lib/state_container.dart

@@ -154,6 +154,7 @@ class StateContainerState extends State<StateContainer> {
   }
 
   void removeNote(Note note) {
+    // FIXME: What if the Note hasn't yet been saved?
     note.parent.remove(note);
     _gitRepo.removeNote(note.filePath).then((NoteRepoResult _) async {
       // FIXME: Is there a way of figuring this amount dynamically?

lib/widgets/journal_list.dart

@@ -77,9 +77,8 @@ class JournalList extends StatelessWidget {
     var title = note.title;
     Widget titleWidget = Text(title, style: textTheme.title);
     if (title.isEmpty) {
-      var date = note.created;
-      if (date != null && date.year < 10) date = note.modified;
-      if (date != null && date.year > 10) {
+      var date = note.modified ?? note.created;
+      if (date != null) {
         var formatter = DateFormat('dd MMM, yyyy  ');
         var dateStr = formatter.format(date);