Fix: Properly handle back function in todo(list) notes
requested to merge 576-return-button-unresponsive-if-the-note-editor-is-active-in-a-nested-task into development
When the todo or todo list page is open and the notes editor is active, we now properly handle the back request. Before, the page would be closed completely (in case of the todo list page) or not closed at all (in case of the todo page).
Closes #576 (closed)