Hide some options from customize

These shouldn't really be set easily. You can always do by reading the
code and just make changes. But for someone happily browsing around in
customize it's a bad idea to change these...

webpaste.el

@@ -65,8 +65,7 @@ default to all providers in order defined in ‘webpaste-providers’ list."
     (python-mode . "python")
     (yaml-mode . "yaml"))
   "Alist that maps `major-mode' names to language names."
-  :type '(alist :key-type symbol :value-type string)
+  :type '(alist :key-type symbol :value-type string))
-  :group 'webpaste)
 
 
 (defcustom webpaste/paste-confirmation nil
@@ -329,7 +328,6 @@ Optional params:
 Consists of provider name and lambda function to do the actuall call to the
 provider.  The lamda should call ‘webpaste-return-url’ with resulting url to
 return it to the user."
-  :group 'webpaste
   :type  '(alist :key-type (string :tag "provider name")
                  :value-type (sexp :tag "webpaste-provider function definition for the provider")))