Remove @SystemApi annotation for an overriding method

Context.registerReceiverForAllUsers are already marked as @SystemApi.
The same method in ContextWrapper overriding it doesn't need to be
annotated as such. In fact, that API is even not recorded in
system-current.txt.

Bug: 144424011
Test: atest CtsSystemApiAnnotationTestCases
Change-Id: I60890104bf20a2c674edd91ec6b487cca1b4e37b

core/java/android/content/ContextWrapper.java

@@ -672,7 +672,6 @@ public class ContextWrapper extends Context {
     /** @hide */
     @Override
     @Nullable
-    @SystemApi
     public Intent registerReceiverForAllUsers(@Nullable BroadcastReceiver receiver,
             @NonNull IntentFilter filter, @Nullable String broadcastPermission,
             @Nullable Handler scheduler) {