Extend the maxTime check for testUnoptimizedBleScans

The test,testUnoptimizedBleScans, will take 2 second for ble scanning,
and 1 second for remaining execution.
Add 0.5 more second to 1.5 total for checking.

Bug: 148920353
Test: run cts -m CtsIncidentHostTestCases -t
      com.android.server.cts.BatteryStatsValidationTest#testUnoptimizedBleScans
Change-Id: I6432eae5e3c21f88e7ff86f11b08bc22e73fa4eb
1 file changed