simple fix to mysql loginscanner

typo caused connection_timeout default to not get set

Author: David Maloney

lib/metasploit/framework/login_scanner/mysql.rb

@@ -78,7 +78,7 @@ def attempt_login(credential)
         # This method sets the sane defaults for things
         # like timeouts and TCP evasion options
         def set_sane_defaults
-          self.connection_timeout || 30
+          self.connection_timeout ||= 30
           self.port               ||= DEFAULT_PORT
           self.max_send_size      ||= 0
           self.send_delay         ||= 0