Fix unlock sim thread leak

The class UnlockSim will be created for each request without the same
instance reuse, but the looper won't be quitted after complete.

To fix it, quit its looper after supply pin is finished.

Test: Manual and atest FrameworksTelephonyTests
Bug: 296322144

Change-Id: I4fea4321738edab284bf1146011c7719bc475649
1 file changed