Hopefully fix a crash provoking bug

Something was causing a crash when using the breadcrumb links
to navigate to another page in the path editing menu while
being in "edit mode" (i.e. in the process of adding a new page).
This resulted in a "Maximum update depth exceeded" error, crashing
the interface. The error hints at circular rendering dependendies,
but unfortunately I couldn't reproduce this myself.

But by attempting to do that I noticed another bug that may or
may not be related: The list of children was missing an entry.
I removed the code doing that, since it didn't seem to be necessary
anyway - this also removed a state setting call that might have
caused too many rerenders.

src/components/events/partials/ModalTabsAndPages/NewTobiraPage.tsx

@@ -112,7 +112,7 @@ const NewTobiraPage = <T extends TobiraFormProps>({
 
 	const select = (page?: TobiraPage) => {
 		if (!page || !page.new) {
-			stopEditing();
+			setEditing(false);
 		}
 		if (!page || formik.values.selectedPage === page) {
 			formik.setFieldValue("selectedPage", undefined);
@@ -171,16 +171,6 @@ const NewTobiraPage = <T extends TobiraFormProps>({
 		select(newPage);
 	};
 
-	const stopEditing = () => {
-		if (editing) {
-			dispatch(setTobiraPage({
-				...currentPage,
-				children: currentPage.children.filter((_, idx) => idx !== currentPage.children.length - 1)
-			}));
-		}
-		setEditing(false);
-	};
-
 	const setPage = (
 		key: number,
 		e: React.ChangeEvent<HTMLInputElement>,