tests: bsim: Bluetooth: Mesh: Adjust timeout for Adv Extensions use

Adjust mesh test timing and timeout value for Advertising
Extensions use/fix in Zephyr Controller. The scanning in
Zephyr Controller is delayed when using extended scanning.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
(cherry picked from commit d1e4c17e6dd43a623ba9396f1e427fb7959b3a44)
2 files changed