Fix incorrect recipient used as threadRecipient to launch MediaPreview

app/src/main/java/org/thoughtcrime/securesms/MediaPreviewActivity.java

@@ -531,7 +531,6 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
   @Override
   public void onLoadFinished(@NonNull Loader<Pair<Cursor, Integer>> loader, @Nullable Pair<Cursor, Integer> data) {
     if (data != null) {
-      @SuppressWarnings("ConstantConditions")
       CursorPagerAdapter adapter = new CursorPagerAdapter(this, GlideApp.with(this), getWindow(), data.first, data.second, leftIsRecent);
       mediaPager.setAdapter(adapter);
       adapter.setActive(true);