Convert SnippetsList to ES6

app/assets/javascripts/snippets_list.js

-(function() {
-  this.gl.SnippetsList = function() {
-    $('.snippets-list-holder .pagination').on('ajax:success', function(e, data) {
-      $('.snippets-list-holder').replaceWith(data.html);
-    });
-  };
-}).call(this);

app/assets/javascripts/snippets_list.js.es6

+(global => {
+  global.gl = global.gl || {};
+
+  gl.SnippetsList = function() {
+    var $holder = $('.snippets-list-holder');
+
+    $holder.find('.pagination').on('ajax:success', (e, data) => {
+      $holder.replaceWith(data.html);
+    });
+  }
+})(window);