Add pair button in bluetooth details page for hearing aid device

Root Cause: Users can not connect another ear again after they cancel
the pairing dialog in Accessibility -> hearing aids entry

Solution: Add pair button in bluetooth details page for hearing aid
device

Bug: 233038449
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=BluetoothDetailsPairOtherControllerTest

Change-Id: I6a7af1c2c2263476b040233edb072cc64a2927b0