Bluetooth: Audio: Align time-outs in babblesim tests

Increase the simulation lengths in the test scripts (where needed) to
be longer than the WAIT_TIME defined in common.h, so that simulations
will not end before the test has a chance to do proper time out.

Signed-off-by: Asbjørn Sæbø <asbjorn.sabo@nordicsemi.no>