mpdparser: Fix missing URI query
When a baseURL in MPD manifest contains a query, then query is not passed to the HTTP requests leading most of a time to 404 errors. Whats more, current behavior is very inconsistent as dashdemux
debug output indicates that its doing requests with query while in souphttpsrc
it can be seen that this is not the case. Be consistent and if query was included in MPD, use it as is.
Closes #821 (closed)