test: enable test-debug-brk-no-arg

Fix issues with disabled test-debug-brk-no-arg and re-enable the test.

PR-URL: #7143
Reviewed-By: Fedor Indutny <[email protected]>

Author: Trott

test/disabled/test-debug-brk-no-arg.js

@@ -0,0 +1,13 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const spawn = require('child_process').spawn;
+
+const child = spawn(process.execPath, ['--debug-brk=' + common.PORT, '-i']);
+child.stderr.once('data', common.mustCall(function() {
+  child.stdin.end('.exit');
+}));
+
+child.on('exit', common.mustCall(function(c) {
+  assert.strictEqual(c, 0);
+}));