An option suggested again when dash entered '-'

If input contain a dash '-' the suggestions include all the options even those that are already provided.

Example:
```
new Command("cmd1")
{
new Option("opt1")
{
Argument = new Argument{ Arity = ArgumentArity.ExactlyOne }
}
}
```

Input: `cmd1 -opt1 aa -`
Suggestions include -op1 again