Skip Zephyr log enable after UHK 60 firmware update

[mondalaci]

Summary

• After firmware update, Agent always re-enabled Zephyr logging for the UHK Dongle and UHK 80 left half, even when those devices were not connected.
• That produced misleading [ZephyrLogService | UHK Dongle] Enabling / [ZephyrLogService | UHK 80 left] Enabling lines at the end of a UHK 60 update log (cosmetic only).
• Re-enable those services only when the matching HID device is present, so UHK 80 still restores logging immediately while UHK 60 stays quiet.

Fixes #3056

Test plan

• Update firmware on a UHK 60 and confirm the update log no longer ends with Dongle / UHK 80 left Zephyr Enabling lines.
• Update firmware on a UHK 80 with a dongle connected and confirm Dongle Zephyr logging is still re-enabled.
• Update firmware on a UHK 80 with the left half connected over USB and confirm left-half Zephyr logging is still re-enabled.

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