lib: remove unused 'e' from catch

PR-URL: #23458
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Hitesh Kanwathirtha <digitalinfinity@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

lib/querystring.js

@@ -109,7 +109,7 @@ function unescapeBuffer(s, decodeSpaces) {
 function qsUnescape(s, decodeSpaces) {
   try {
     return decodeURIComponent(s);
-  } catch (e) {
+  } catch {
     return QueryString.unescapeBuffer(s, decodeSpaces).toString();
   }
 }