mypy: Remove unneeded int(...)

Follow-up to 377bdf736f - less confusing
that way IMHO, as the value now is already an int in that branch.

qutebrowser/utils/qtutils.py

@@ -611,4 +611,4 @@ def extract_enum_val(val: Union[sip.simplewrapper, int, enum.Enum]) -> int:
         return val.value
     elif isinstance(val, sip.simplewrapper):
         return int(val)  # type: ignore[call-overload]
-    return int(val)
+    return val