Call onKeysRemoved (not onKeysRestored) when releasing offline keys

Looks like this change was introduced in
<unknown commit>

onKeysRemoved is currently not triggered in DefaultDrmSessionManager
as far as I can tell. It seems like it should be called from here.

PiperOrigin-RevId: 317072794

library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSession.java

@@ -467,7 +467,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
       byte[] responseData = (byte[]) response;
       if (mode == DefaultDrmSessionManager.MODE_RELEASE) {
         mediaDrm.provideKeyResponse(Util.castNonNull(offlineLicenseKeySetId), responseData);
-        dispatchEvent(DrmSessionEventListener::onDrmKeysRestored);
+        dispatchEvent(DrmSessionEventListener::onDrmKeysRemoved);
       } else {
         byte[] keySetId = mediaDrm.provideKeyResponse(sessionId, responseData);
         if ((mode == DefaultDrmSessionManager.MODE_DOWNLOAD