Transmitter mode fails to unmute if shortcut is pressed too quickly

```
What steps will reproduce the problem?
1. Put MicMute in transmitter mode.
2. Tap MicMute shortcut for an very short amount of time.

What is the expected output? What do you see instead?
MicMute enables the microphone without disabling it.

What version of the product are you using? On what operating system?
MicMute 0.1.7.2 on Windows 7 64 bit
```

Original issue reported on code.google.com by `Yadder...@gmail.com` on 18 Dec 2014 at 2:31