Media Capture Audio Not working on Android

There was a previous commit that made the video/image capture run in a runnable, but the audio capture wasn't modified. I found that the app was crashing, telling me I can't run IO operations on the UI thread when I try to capture audio. Making the capture audio run in a runnable like the other two seemed to fix the problem.

Here is my comment on the previous commit that includes the code that I changed:

https://github.com/apache/cordova-plugin-media-capture/commit/237d55f64ba68e4c70bb33750b4a7f3fdbfeda3e#commitcomment-4728529