R1:308c4f240754

Fix "AphrontRequest->getRequestURI()" for requests with "x[]=1" parameters in the URI

Summary:
Ref T13250. See PHI1069. This is a small fix for `getRequestURI()` currently not working if the request includes "x[]=..." PHP-flavored array parameters, beacause they're parsed into arrays by `$_GET` and `setQueryParams(...)` no longer accepts nonscalars.

Instead, just parse the raw request URI.

Test Plan: Visited `/search/hovercard/?phids[]=X`, no more fatal. Dumped the resulting URI, saw it had the right…