Fixed regression with loading values in JOSM. Closes #24.

Thanks very much to @dex2000. Regression happend in
https://github.com/ypid/opening_hours_map/commit/5a96a555a3edd0125dd2f545a9d0aa5f478936e8
I removed this because I could not remember what that was doing in the
HTML. Honestly, I did not even run `ack` to check if the div was used by
anything. Should not happen again …