fix(pat slides): The slides initialization did not work since some time. This is now fixed.

Author: thet

src/pat/slides/slides.js

@@ -18,7 +18,7 @@ var slides = {
     },
 
     async init($el) {
-        if (!this.el.querySelector(".slide")) {
+        if (!$el[0].querySelector(".slide")) {
             // no slides, nothing to do.
             return;
         }