Revert "move process.stdin.unref call inside setupHistory callback"

This reverts commit e388d3b.

Note: it didn't really solve the CI issue unfortunately

Author: dario-piotrowicz

test/parallel/test-repl-no-terminal.js

@@ -3,6 +3,5 @@ const common = require('../common');
 
 const repl = require('repl');
 const r = repl.start({ terminal: false });
-r.setupHistory('/nonexistent/file', common.mustSucceed(() => {
-  process.stdin.unref?.();
-}));
+r.setupHistory('/nonexistent/file', common.mustSucceed());
+process.stdin.unref?.();