Bluetooth: audio: has: Don't revert features value on error

This removes revering the features value back to previous state if work
submission failes. Even if it fails it indicates an internal sysworkq
issue, so even retry won't help. The client can read the features value
anyway, thus it's sane to just log an error in such case.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>