Fix deck check and thus blue snyc arrow bug

Cast col.decks.selected() to int so the return type fits the annotation.
Thus, fix the comparison in col.decks.select() which was leading to
a superfluous db modification and in turn to a false indication of a
necessary sync right after another one in certain cases.

pylib/anki/decks.py

@@ -430,7 +430,7 @@ class DeckManager:
 
     def selected(self) -> int:
         "The currently selected did."
-        return self.col.conf["curDeck"]
+        return int(self.col.conf["curDeck"])
 
     def current(self) -> Deck:
         return self.get(self.selected())