readline: close dumb terminals on Control+C

This commit adds support for closing a readline interface
on Control+C when the terminal is dumb.

PR-URL: https://github.com/nodejs/node/pull/29149
Fixes: https://github.com/nodejs/node/issues/29111
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/readline.js

@@ -823,6 +823,8 @@ function _ttyWriteDumb(s, key) {
       // This readline instance is finished
       this.close();
     }
+
+    return;
   }
 
   switch (key.name) {