Editors: Allow the title to be edited even when YAML is disabled

lib/editors/checklist_editor.dart

@@ -177,7 +177,7 @@ class ChecklistEditorState extends State<ChecklistEditor>
       parentFolder: widget.note.parent,
       body: Column(
         children: <Widget>[
-          if (widget.note.canHaveMetadata) titleEditor,
+          titleEditor,
           Expanded(child: FocusScope(child: checklistWidget)),
         ],
       ),

lib/editors/markdown_editor.dart

@@ -114,11 +114,10 @@ class MarkdownEditorState extends State<MarkdownEditor>
     var editor = EditorScrollView(
       child: Column(
         children: <Widget>[
-          if (note.canHaveMetadata)
-            NoteTitleEditor(
-              _titleTextController,
-              _noteTextChanged,
-            ),
+          NoteTitleEditor(
+            _titleTextController,
+            _noteTextChanged,
+          ),
           NoteBodyEditor(
             textController: _textController,
             autofocus: widget.isNewNote,

lib/widgets/note_viewer.dart

@@ -62,7 +62,7 @@ class NoteViewer extends StatelessWidget {
     var view = EditorScrollView(
       child: Column(
         children: <Widget>[
-          if (note.canHaveMetadata) NoteTitleHeader(note.title),
+          NoteTitleHeader(note.title),
           Padding(
             padding: const EdgeInsets.only(top: 8.0, bottom: 8.0),
             child: MarkdownBody(