le_audio: Correct typo for BLE headset output communication device

Patch corrects typo for pairing output BLE headset device with input
device.

Tag: #feature
Test: Select BLE output headset as communication device
Sponsor: jpawlowski@
Bug: 150670922
Change-Id: I7b0f41cb3f90096d9e19337ed1e3952a3dcdff3f
Merged-In: I7b0f41cb3f90096d9e19337ed1e3952a3dcdff3f