worker: fix variable referencing in template string

PR-URL: #33467
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/internal/worker.js

@@ -215,7 +215,7 @@ class Worker extends EventEmitter {
     this[kDispose]();
     if (customErr) {
       debug(`[${threadId}] failing with custom error ${customErr} \
-        and with reason {customErrReason}`);
+        and with reason ${customErrReason}`);
       this.emit('error', new errorCodes[customErr](customErrReason));
     }
     this.emit('exit', code);