fix pmd issue

app/src/main/java/chat/rocket/android/model/internal/GcmPushRegistration.java

@@ -13,6 +13,7 @@ import chat.rocket.android.model.SyncState;
  * just stores gcm registration status.
  */
 public class GcmPushRegistration extends RealmObject {
+  @SuppressWarnings({"PMD.ShortVariable"})
   private static final String ID = "dummyId";
   public static final String SYNC_STATE = "syncState";
   public static final String GCM_PUSH_ENABLED = "gcmPushEnabled";

app/src/main/java/chat/rocket/android/service/observer/CurrentUserObserver.java

@@ -8,7 +8,6 @@ import java.util.ArrayList;
 import java.util.List;
 import chat.rocket.android.api.DDPClientWrapper;
 import chat.rocket.android.api.MethodCallHelper;
-import chat.rocket.android.api.RaixPushHelper;
 import chat.rocket.android.helper.LogcatIfError;
 import chat.rocket.android.model.ddp.User;
 import chat.rocket.android.realm_helper.RealmHelper;