Fix check method

Author: jvazquez-r7

modules/exploits/unix/webapp/joomla_akeeba_exec.rb

@@ -58,10 +58,11 @@ def initialize(info={})
   end
 
   def check
-    send_request_cgi(
-      'uri'    => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', 'restoration.php')
+    res = send_request_cgi(
+      'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', 'restoration.php')
     )
-    if res and (res.code == 200)
+
+    if res && res.code == 200
         return Exploit::CheckCode::Detected
     end