tests: default/spiegel.json: Use a more recent test URL
tests: default/spiegel.json: Use a more recent test URL

The previously used test URL defaulted to media stream that is listed
in the returned XML data but appears to be missing (HTTP/404). The
XML does not seem to indicate the stream availability, either.

Signed-off-by: Toni Gundogdu <eac2284b3c43676907b96f08de9d3d52d5df0361@gmail.com>

DangerCove/libquvi-scripts,legatvs/libquvi-scripts,legatvs/libquvi-scripts,alech/libquvi-scripts,alech/libquvi-scripts,DangerCove/libquvi-scripts