synology-surveillance-station-client: revert to 2.2.0

[philippwaller]

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In the following questions <cask> is the token of the cask you're submitting.

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• The submission is for a stable version or documented exception.
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• Named the cask according to the token reference.
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---

Version 2.2.1 of the SurveillanceStationClient has been recalled due to a reported issue. The version is no longer available for download.

This PR updates the Homebrew formula to roll back to the previous stable version.

For more details, refer to the official Synology change log.

[daeho-ro]

          {
            "version": "2.2.1-2564",
            "publish_date": "2024-11-26",
            "content": "\u003Cp\u003EThis update was recalled on January 20, 2025, due to a memory leak issue. This issue occurs when playing camera streams with the AAC audio codec on Windows 10 version 22H2, causing software unavailability. We sincerely apologize for the inconvenience and are actively working on a resolution.\u003C/p\u003E\n",
            "is_rolling": false
          },