fix(client): fix position calculation of nested context menu

packages/frontend/src/components/MkMenu.child.vue

@@ -44,6 +44,10 @@ function onChildClosed(actioned?: boolean) {
 	}
 }
 
+watch(() => props.targetElement, () => {
+	setPosition();
+});
+
 onMounted(() => {
 	setPosition();
 	nextTick(() => {