Note's title is no longer part of the metadata

So even if the YAML metadata is disabled, the title can be set.

lib/core/note.dart

@@ -157,8 +157,6 @@ class Note with NotesNotifier {
   }
 
   set title(String title) {
-    if (!canHaveMetadata) return;
-
     _title = title;
     _notifyModified();
   }