WebStyle: fix content type change detection

* Fixes property value of `content_type_set_p` on
  `SimulatedModPythonRequest` object causing problems in `_check_result`
  function.

Reported-by: Yannick Tapparel <yannick.tapparel@cern.ch>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
installation: fix Apple touch icons in Apache conf

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>