Use new PackageMonitor#register() without externalStorage parameter

The externalStorage is not be used now, we are migrate to use new
method.

Bug: 29385425
Test: atest PackageUpdateMonitorTest
Change-Id: I3ba3aaf2d723f720dd4b84774c7a6d297a0c0039

packages/SystemUI/src/com/android/systemui/controls/controller/PackageUpdateMonitor.kt

@@ -52,7 +52,7 @@ constructor(
     /** Start monitoring for package updates. No-op if already monitoring. */
     fun startMonitoring() {
         if (monitoring.compareAndSet(/* expected */ false, /* new */ true)) {
-            register(context, user, false, bgHandler)
+            register(context, user, bgHandler)
         }
     }