Make 3 attempts to start AudioRecord

On Android 11, a fake popup must be briefly opened to make the system
think that the shell app is in the foreground so that audio may be
recorded.

Making the shell app foreground may take some time depending on the
device, so make 3 attempts, waiting 100ms before each.

Fixes #3796 <https://github.com/Genymobile/scrcpy/issues/3796>