Fix updated flake rules

Author: k1o0

ibllib/misc/qt.py

@@ -41,5 +41,5 @@ def wrapped(*args, **kwargs):
 @require_qt
 def run_app():  # pragma: no cover
     """Run the Qt application."""
-    global QT_APP
+    global QT_APP  # noqa F841
     return QT_APP.exit(QT_APP.exec_())