GetoptMode = true suppresses help.

**Describe the bug**
var parser = new Parser(opts => { opts.GetoptMode = true; });
result = parser.ParseArguments....

opts.GetoptMode = true causes the help to be suppressed

**To Reproduce**
Make your own "new Parser" with only GetoptMode = true

**Expected behavior**
The help should show up regardless

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Additional context**
Appending other options to "new Parser" didn't seem to help.