fix broken ajax for large repository trees (regression caused in !7208)

app/views/projects/refs/logs_tree.js.haml

@@ -14,8 +14,8 @@
       // Load more commit logs for each file in tree
       // if we still on the same page
       var url = "#{escape_javascript(@more_log_url)}";
-      ajaxGet(url);
+      gl.utils.ajaxGet(url);
     }
 :plain
-  gl.utils.localTimeAgo($('.js-timeago', 'table.table_#{@hex_path} tbody'));
\ No newline at end of file
+  gl.utils.localTimeAgo($('.js-timeago', 'table.table_#{@hex_path} tbody'));