Correct the padding of the new button group on the files page

IPython/html/static/tree/less/tree.less

@@ -156,6 +156,10 b' input.engine_num_input {'
     .icon(@fa-var-file-o)
 }
 
+#new-buttons {
+    padding-top: 2px;
+}
+
 ul#new-menu {
     // align right instead of left
     left: auto;