Code review comment for lp://staging/~d.filoni/indicator-datetime/lp1364647

I found an issue testing commit 461 and fixed it in commit 462: I unplugged headphones after 5 seconds from alarm start (so when port switched to speakers) and closing the notification port was reset to headphones, so audio was not working. With commit 462 headphones port is not restored if it's not available anymore.