hgweb: avoid invalid infinity scroll request when overwritten web.style
Infinity scroll is broken when you override the web.style in the following ways:
$ hg --config='web.style=gitweb' serve
$ open http://localhost:8080/shortlog?style=paper
ajaxScrollInit should use http://localhost:8080/shortlog/%next%?style=paper.
however, http://localhost:8080/shortlog/%next% is used actually.
It is missing style parameter.
This patch add style parameter to request url.