Use new PackageMonitor#register() without externalStorage parameter

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

Bug: 29385425
Test: build and boot home
Change-Id: I20f79b23cef78718c2abd3c849478635756a2b89

services/core/java/com/android/server/pm/LauncherAppsService.java

@@ -372,7 +372,7 @@ public class LauncherAppsService extends SystemService {
                 filter.addDataScheme("package");
                 mContext.registerReceiverAsUser(mPackageRemovedListener, UserHandle.ALL, filter,
                         /* broadcastPermission= */ null, mCallbackHandler);
-                mPackageMonitor.register(mContext, UserHandle.ALL, true, mCallbackHandler);
+                mPackageMonitor.register(mContext, UserHandle.ALL, mCallbackHandler);
                 mIsWatchingPackageBroadcasts = true;
             }
         }