audiopolicy: Fix after commit 11d30104

The change ag/5874343 switched to DeviceVector usage instead of
audio_devices_t. In AudioPolicyManager::setOutputDevices, one of
the conditions comparing a device to AUDIO_DEVICE_NONE had been
inverted.

This was resulting in resetting of default patches during
a call to 'setForceUse' function.

Test: audiopolicy_tests
Change-Id: Idc43bc152c3d749cd1dab9b696e7e1e700ef3926