fix: only import window if necessary (#869)

Only import window if necessary

Author: abrichr

openadapt/models.py

@@ -525,6 +525,8 @@ def get_active_window_event(
         Returns:
             (WindowEvent) the active window event.
         """
+        from openadapt import window
+
         return WindowEvent(**window.get_active_window_data(include_window_data))
 
     def scrub(self, scrubber: ScrubbingProvider | TextScrubbingMixin) -> None: