Use appropriate types for a11y names

When not recording, the screen record tile acts as a button (opens the
dialog), but during recording, it acts as a switch (ends recording). So,
update the a11y class name to match behavior in each state

Fixes: 378437133
Flag: EXEMPT bugfix
Test: manual
Change-Id: Ie2d8594b3e311329eb5a3a6255e500ac3c4b309f