Fix finder query in Msf::DBManager::Vuln

MSP-12152

* This is part of updating finder queries to be Rails 4 compatibile
* In #find_vuln_by_details, pass in conditons hash crit rather than symbol :crit

Author: ccatalan-r7

lib/msf/core/db_manager/vuln.rb

@@ -31,15 +31,15 @@ def find_vuln_by_details(details_map, host, service=nil)
     vuln = nil
 
     if service
-      vuln = service.vulns.includes(:vuln_details).where(:crit).first
+      vuln = service.vulns.includes(:vuln_details).where(crit).first
     end
 
     # Return if we matched based on service
     return vuln if vuln
 
     # Prevent matches against other services
     crit["vulns.service_id"] = nil if service
-    vuln = host.vulns.includes(:vuln_details).where(:crit).first
+    vuln = host.vulns.includes(:vuln_details).where(crit).first
 
     return vuln
   end