Use catch :default for default error handling in cljs

This is considered normal practice for cljs. See
https://clojure.atlassian.net/browse/CLJS-661 for when it was introduced
and background on it

src/main/frontend/extensions/pdf/utils.cljs

@@ -173,13 +173,13 @@
   []
   (try
     (js-invoke js/window.lsPdfViewer "nextPage")
-    (catch js/Error _e nil)))
+    (catch :default _e nil)))
 
 (defn prev-page
   []
   (try
     (js-invoke js/window.lsPdfViewer "previousPage")
-    (catch js/Error _e nil)))
+    (catch :default _e nil)))
 
 (comment
  (fix-selection-text-breakline "this is a\ntest paragraph")