tests: AppLaunch - increase sleep duration after resetting iorapd

Makes it less likely we'll launch the next app too quickly after
restarting iorapd.

Bug: 152322429
Test: am instrument
Change-Id: I4fc35665f03ae7d9fe073accfcb1e04842c737dd
Merged-In: I4fc35665f03ae7d9fe073accfcb1e04842c737dd