Modify primer to utilise file_contents macro.

Author: Matthew Hall

modules/exploits/windows/http/struts_http_jspinject.rb

@@ -69,7 +69,7 @@ def check
   end
 
   def primer 
-    self.exe_contents = payload.encoded 
+    self.file_contents = payload.encoded 
     print_status("File available on #{unc}...")
     share = "#{unc}"
     sploit = datastore['URI']