More on search url

hi @conejoninja

With this pull request 
1. add missing firstUrl varible declaration.
2. put back 'page' => 'search' at osc_update_search_url().

if there is 'page' => 'search' params at osc_search_url then it will go to subdomain MAIN page 
http://subdomain.domain.tld
if there is no search params it will go to subdomain SEARCH page
http://subdomain.domain.tld

With this commit. 
1. osc_region_list_url will go to subdomain MAIN page
2. osc_search_show_all_url will go to subdomain SEARCH page