added 'search' ARIA role on searchform.php
added 'search' ARIA role on searchform.php

http://www.w3.org/TR/wai-aria/roles#search
Signed-off-by: Brett Taylor <f6bbf8de8af9fcf8c80733d0caa7a4ef8676c0b7@webfroot.co.nz>

madeso-uk/vcsassist,carl-alberto/business-portfolio,vaishaliagola27/_s,vaishaliagola27/_s,jchck/jchck_,SparkartGroupInc/nadando,andbaz/launchbaz,solidusjs/wp-solidus,andbaz/launchbaz,vaishaliagola27/_s,jchck/jchck_,madeso-uk/vcsassist,carl-alberto/business-portfolio