fix: isSonginPlayList condition

app/src/main/java/com/cappielloantonio/tempo/ui/dialog/PlaylistChooserDialog.java

@@ -101,7 +101,7 @@ public class PlaylistChooserDialog extends DialogFragment implements ClickCallba
         Playlist playlist = bundle.getParcelable(Constants.PLAYLIST_OBJECT);
 
         playlistChooserViewModel.isSongInPlaylist(Objects.requireNonNull(playlist).getId(), requireActivity()).observe(requireActivity(), songInPlaylist -> {
-            if (songInPlaylist) {
+            if (!songInPlaylist) {
                 playlistChooserViewModel.addSongToPlaylist(playlist.getId());
                 dismiss();
             } else {