Remove TODO related to WakeLocks

There's no need to keep a WakeLock in the RulesManager - if
the device goes to sleep it should continue the work when
it wakes up again. All I/O is handled via AtomicFile and should
be robust to corruption, etc. and this reduces the likelihood
of issues caused by sudden sleeps.

Bug: 31008728
Test: make
Change-Id: I3d5076ca7d2f39076f76bdb745cedde214eac21b

services/core/java/com/android/server/timezone/RulesManagerServiceHelperImpl.java

@@ -57,7 +57,6 @@ final class RulesManagerServiceHelperImpl implements PermissionHelper, Executor
         return true;
     }
 
-    // TODO(nfuller): Wake lock required while running in background thread?
     @Override
     public void execute(Runnable runnable) {
         AsyncTask.execute(runnable);