Fix the Hearing Aids connected state in Settings App

When two Hearing Aids devices are bonded, we should only show one device
in the Settings App and at the correct location based on the connected
state of the HA devices. When at least one HA device is connected, then
the Settings App should show it as connected. Otherwise, the Settings
App should show it as disconnected when both devices are disconnected.

Bug: 79760469
Test: Run the robotests for Settings and SettingsLib
Change-Id: I33e19af054b686b3d71b00dcbd6ff16febde6099