Do not defined url_var_name as "q" in wawp.php

[Cameron Wong]

Hi all,

I change url_var_name from q to proxy_url in order not to conflict
with Baidu search engine. (Some strange string will appear in
searching text box. This was fixed in r220 but was restored later by
someone.)

http://code.google.com/p/webanywhere/source/detail?r=220

Please do not restore it again unless you have reasonable explanation.

Thank you!

Cameron