test: fix test-readline-interface

Previous unit test delay is too short for parallel test on raspberry pi,
it will fail sometimes.  This PR use common.platformTimeout and widen
the time gap.

PR-URL: https://github.com/nodejs/node/pull/14677
Ref: https://github.com/nodejs/node/issues/14674
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

test/parallel/test-readline-interface.js

@@ -331,8 +331,8 @@ function isWarned(emitter) {
   // over the default crlfDelay but within the setting value
   {
     const fi = new FakeInput();
-    const delay = 200;
-    const crlfDelay = 500;
+    const delay = 125;
+    const crlfDelay = common.platformTimeout(1000);
     const rli = new readline.Interface({
       input: fi,
       output: fi,