"acitve" should be "aggressive"

fixes http://dev.metasploit.com/redmine/issues/7926 which prevented a
proper search using:
msf> search exploit:type app:server
Merge pull request #1783 from kernelsmith/bug/RM7926-msfconsole_search_app_server_busted

fixes RM7926 msfconsole search busted