test: remove obsolete code

The removed line does not add anything of value to the test. It was
removed to simplify the test.

PR-URL: https://github.com/nodejs/node/pull/25731
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

test/parallel/test-repl-tab-complete-no-warn.js

@@ -15,7 +15,6 @@ const testMe = repl.start('', putIn);
 // `Runtime.executionContextCreated` listener
 process.on('warning', common.mustNotCall());
 
-putIn.run(['.clear']);
 putIn.run(['async function test() {']);
 for (let i = 0; i < DEFAULT_MAX_LISTENERS; i++) {
   testMe.complete('await Promise.resolve()', () => {});