Update hearing device dialog UI

To match current Bluetooth dialog UI launched from QS tile, the
following updates are applied:

1. The divider between device name and the gear icon
2. The horizontal spacing for a device item

Flag: EXEMPT bugfix
Bug: 370645236
Test: manually check the UI, screenshot attached on bug
Change-Id: I4151ceae809aba482eb5d6b153c40dc89d96d1e8