fix response codes check to avoid second tries to fail

Author: jvazquez-r7

modules/exploits/windows/http/umbraco_upload_aspx.rb

@@ -162,7 +162,7 @@ def exploit
 			return
 		end
 
-		if (res.code < 200 or res.code >= 300)
+		if (res.code < 200 or res.code > 302)
 			print_error("#{@peer} - Execution failed on #{upload_path} [#{res.code} #{res.message}]")
 			return
 		end