Fix output switch will show empty slice

Use MediaDevice in the list to add row instead of use connectedDevice.
Becauae connectedDevice that got from getCurrentConnectedMediaDevice()
could be null.

Bug: 157611605
Test: make -j42 RunSettingsRoboTests
Change-Id: Ib51e3e436e65a9aaa5a35488191b8b2ad9cb6a4b
1 file changed