fix(plugin:FB): fix showDialog param to use option

Author: pbernasconi

src/plugins/facebook.js

@@ -46,10 +46,10 @@ angular.module('ngCordova.plugins.facebook', [])
         return q.promise;
       },
 
-      showDialog: function (permissions) {
+      showDialog: function (options) {
 
         var q = $q.defer();
-        facebookConnectPlugin.showDialog(permissions,
+        facebookConnectPlugin.showDialog(options,
           function (res) {
             q.resolve(res);
           },