Reimplement handling of "stop" button.

Appears this got lost in the changes from "case" to "if/else".

Bug: 224715583
Test: run test. Press "record" (note mic icon and button states),
  Press "stop" (not mic icon disappears and button states).
Change-Id: I93d4bc07ece5a4ac2ea1638cf60ef61ca1ec027a
1 file changed