Fix AttributeError in Activity class

[Liudon]

When enable IGNORE_BEFORE_SAVING, workflow run failed:

Run python run_page/strava_sync.py *** *** ***
Traceback (most recent call last):
  File "/home/runner/work/workouts_page/workouts_page/run_page/strava_sync.py", line 33, in <module>
Access ok
    run_strava_sync(
  File "/home/runner/work/workouts_page/workouts_page/run_page/strava_sync.py", line 14, in run_strava_sync
    generator.sync(False)
  File "/home/runner/work/workouts_page/workouts_page/run_page/generator/__init__.py", line 68, in sync
    activity.summary_polyline = filter_out(activity.summary_polyline)
AttributeError: 'Activity' object has no attribute 'summary_polyline'
Start syncing
Error: Process completed with exit code 1.

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Name	Status	Preview	Comments	Updated (UTC)
running-page	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 21, 2024 2:25pm

[yihong0618]

nice catch

[Liudon]

sorry, i commit my code to this branch, i create a new pr.😓😓😓