path: use the correct name in validateString

The parameter was renamed from `ext` to `suffix`
but not in the `validateString` call.

PR-URL: #53669
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Deokjin Kim <deokjin81.kim@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/path.js

@@ -775,7 +775,7 @@ const win32 = {
    */
   basename(path, suffix) {
     if (suffix !== undefined)
-      validateString(suffix, 'ext');
+      validateString(suffix, 'suffix');
     validateString(path, 'path');
     let start = 0;
     let end = -1;
@@ -1335,7 +1335,7 @@ const posix = {
    */
   basename(path, suffix) {
     if (suffix !== undefined)
-      validateString(suffix, 'ext');
+      validateString(suffix, 'suffix');
     validateString(path, 'path');
 
     let start = 0;