Fix preferences under Related category can not launch its own page in bluetooth device details page

Root Cause: KeyboardSettingsPreferenceController override
handlePreferenceTreeClick() without checking the preference key, it will lead to handle all preferences' click action.

Solution: Check the preference is the expected preference key

Bug: 264017256
Test: make RunSettingsRoboTests ROBOTEST_FILTER=KeyboardSettingsPreferenceControllerTest
Change-Id: Idcdadc323df5b758b4b21329227e2bb721b1c394