fix regex

Author: firefart

modules/exploits/multi/http/mantisbt_php_exec.rb

@@ -74,7 +74,7 @@ def get_mantis_version
       'data'     => xml.to_s
     })
     if res && res.code == 200
-      match = res.body.match(/<ns1:mc_versionResponse><return xsi:type="xsd:string">(.+)<\/return><\/ns1:mc_versionResponse>/)
+      match = res.body.match(/<ns1:mc_versionResponse.*><return xsi:type="xsd:string">(.+)<\/return><\/ns1:mc_versionResponse>/)
       if match && match.length == 2
         version = match[1]
         print_status("Detected Mantis version #{version}")