Closes #6731 - fixed BookmarkNode minus operator and deleteOperation

app/src/main/java/org/mozilla/fenix/ext/BookmarkNode.kt

@@ -15,5 +15,9 @@ val Context.bookmarkStorage: PlacesBookmarksStorage
  * Removes [children] from [BookmarkNode.children] and returns the new modified [BookmarkNode].
  */
 operator fun BookmarkNode.minus(children: Set<BookmarkNode>): BookmarkNode {
-    return this.copy(children = this.children?.filter { it !in children })
+    return this.copy(children = this.children?.filter { filtered ->
+        children.none {
+            it.guid == filtered.guid
+        }
+    })
 }

app/src/main/java/org/mozilla/fenix/library/bookmarks/BookmarkFragment.kt

@@ -254,7 +254,7 @@ class BookmarkFragment : LibraryPageFragment<BookmarkNode>(), UserInteractionHan
         bookmarkInteractor.onBookmarksChanged(bookmarkTree)
 
         val deleteOperation: (suspend () -> Unit) = {
-            deleteSelectedBookmarks(selected)
+            deleteSelectedBookmarks(pendingBookmarksToDelete)
             pendingBookmarkDeletionJob = null
             // Since this runs in a coroutine, we can't depend upon the fragment still being attached
             metrics?.track(Event.RemoveBookmarks)