fixed ajax endpoint for styling plugin

lib/plugins/styling/script.js

@@ -39,7 +39,7 @@ jQuery(function () {
             params[params.length] = {name: 'run', value: 'preview'};
 
             jQuery.post(
-                    DOKU_BASE + '/lib/exe/ajax.php',
+                    DOKU_BASE + 'lib/exe/ajax.php',
                 params,
                 styling_updateCSS
             );
@@ -48,7 +48,7 @@ jQuery(function () {
 
     // load the dialog content and apply listeners
     $dialog.load(
-            DOKU_BASE + '/lib/exe/ajax.php',
+            DOKU_BASE + 'lib/exe/ajax.php',
         {
             'call': 'plugin_styling',
             'run':  'html',