removed dependency on note tree widget from app context

src/public/javascripts/widgets/note_tree.js

@@ -35,8 +35,6 @@ export default class NoteTreeWidget extends TabAwareWidget {
 
         window.glob.cutIntoNote = () => this.cutIntoNoteListener();
 
-        this.appContext.noteTreeWidget = this;
-
         this.tree = null;
     }
 

src/public/javascripts/widgets/search_box.js

@@ -107,6 +107,7 @@ export default class SearchBoxWidget extends BasicWidget {
             return;
         }
 
+        // FIXME
         let activeNode = appContext.getMainNoteTree().getActiveNode();
         const parentNote = await treeCache.getNote(activeNode.data.noteId);