Remove the "abort" listener, on the globalAbortSignal, in the web/sidebar.js file

This is consistent with a bunch of other viewer code, since an `AbortSignal` can only be aborted once any "abort" listeners can thus be removed when invoked.

Author: Snuffleupagus

web/sidebar.js

@@ -79,7 +79,10 @@ class Sidebar {
     toggleButton.addEventListener("click", this.toggle.bind(this));
     this._isOpen = false;
     sidebar.hidden = true;
-    globalAbortSignal?.addEventListener("abort", this.destroy.bind(this));
+    globalAbortSignal?.addEventListener("abort", this.destroy.bind(this), {
+      once: true,
+    });
+
     this.#resizeObserver = new ResizeObserver(
       ([
         {