Disable bluetooth toggle test for devices with leanback UX

Devices with leanback UX, often controlled via a remote,
typically connects to the device over a bluetooth or Wi-Fi
connection. Thus if bluetooth is disabled, the device might
loss it's control which makes it difficult to go to the next
step of the test - to enable bluetooth.

Bug: 18283388
Change-Id: Ic79cb754ec8947e798823422c650869e07bf0730