UseStatusCodePagesWithReExecute shouldn't pass through the QueryString from the original request

[ryanbrandenburg]

This method currently will pass the Query string from the original request to the re-executed request, even though the path has changed. @Eilon and I were thinking that it should probably be cleared and restored at the same time the original path is restored.

[ryanbrandenburg]

CC @Tratcher

[Eilon]

Indeed, using the original query string for the new request seems a tiny bit risky because it could quite likely affect the behavior of the sub-request. Obviously we don't want to clear everything, but if we change the path, we ought to change the rest of the URL, which means changing the query string.