Bluetooth: Audio: Align BabbleSim simulation lengths with other tests

Use same simulation length for TBS, bass, broadcas and unicast as for
the other tests.  Simulation length must be larger than time-out
value, to give the test a chance to time out.

The time-out value have previosly been aligned for the other tests.
TBS was not done at that time, as it was still being upstreamed.
(Unsure about why bass, unicast and broadcast were not done at the
same time - they may have been in PRs).

See commits f7cd6afb and
73f5ffcf

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