Only show the lighter curtain if autoreload is on

I added this cause I'm slightly worried about other server environments
sending the same 1012 close code.

Author: jcheng5

inst/www/shared/shiny-autoreload.js

@@ -96,7 +96,7 @@ pre.shiny-text-output {
   pointer-events: none;
 }
 
-#shiny-disconnected-overlay.reloading {
+html.autoreload-enabled #shiny-disconnected-overlay.reloading {
   opacity: 0;
   animation: fadeIn 250ms forwards;
   animation-delay: 1s;

inst/www/shared/shiny-autoreload.js.map

@@ -1,5 +1,7 @@
 /* eslint-disable unicorn/filename-case */
 
+document.documentElement.classList.add("autoreload-enabled");
+
 const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
 // Add trailing slash to path, if necessary, before appending "autoreload"
 const defaultPath =