tests: Bluetooth: PBP: Fix several issues in the PBP bsim tests

The PBP bsim tests had several issues that was not uncovered
until the PA sync timeout was increased. This commit fixes these,
as well as increase some timeout values due to recently
increased PA sync timeout.

Among the issues were lack of support for the alternating PBA
features, missing reset of values and specific time sleeps.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>