Fix TimesFM 2.5 window_size AttributeError

[kashif]

Passing window_size to TimesFm2_5ModelForPrediction crashed because forward called self._timesfm_moving_average, but the modular converter renames the static method to _timesfm2_5_moving_average. Fixed the call site to match.

Fixes #46821

Repro from the issue now runs fine:

model(past_values=forecast_input_tensor, window_size=5)

[vasqu]

Can we add a fast test but modular got us good :D

[github-actions]

[For maintainers] Suggested jobs to run (before merge)

run-slow: timesfm2_5

[github-actions]

Thank you for your contribution 🤗!

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[github-actions]

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CI recap

Dashboard: View test results in Grafana
Latest run: 29501487908:1
Result: success | Jobs: 2 | Tests: 10 | Failures: 0 | Duration: 40s

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