fix for ghost note becoming stuck after note selection deleted.

- thanks ristic for the report

gtk2_ardour/midi_region_view.cc

@@ -2143,6 +2143,8 @@ MidiRegionView::delete_selection()
 	_selection.clear();
 
 	apply_diff ();
+
+	_note_entered = false;
 	hide_verbose_cursor ();
 }