PTS-bot: fix reset

Add a delay between disable and enable in reset to avoid
Bluetooth to be disabled unwillingly after.

Bug: 234892968
Bug: 241962982
Test: atest pts-bot -v
Ignore-AOSP-First: Cherry-picked from AOSP
Merged-In: I72d0f4366de7dca330c5e10c0bab4f4fab7e1500
Change-Id: I72d0f4366de7dca330c5e10c0bab4f4fab7e1500