another one liner god damn it

Fixes a crash when there's some previously focused text fields,
and the user tries to exit via the confirmation dialog.
Before a state switch HaxeUI tries to reset the tooltip manager and
remove all components, which in this case causes it to refocus a text field,
which tries to access a destroyed camera to retrieve the bounds.
Doing this ensures there's no text fields for it to do that.

source/funkin/ui/debug/charting/ChartEditorState.hx

@@ -5710,6 +5710,8 @@ class ChartEditorState extends UIState // UIState derives from MusicBeatState
       return;
     }
 
+    this.hideAllToolboxes();
+
     stopWelcomeMusic();
     // TODO: PR Flixel to make onComplete nullable.
     if (audioInstTrack != null) audioInstTrack.onComplete = null;