querystring: remove unused catch bindings

PR-URL: https://github.com/nodejs/node/pull/24079
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Wyatt Preul <wpreul@gmail.com>

lib/querystring.js

@@ -448,7 +448,7 @@ function parse(qs, sep, eq, options) {
 function decodeStr(s, decoder) {
   try {
     return decoder(s);
-  } catch (e) {
+  } catch {
     return QueryString.unescape(s, true);
   }
 }