Help of a subcommand prints also options from the main command

[tfonfara]

--help flag of a subcommand or also help <subcommand> does also print options from the main command

ArgumentParser version: main
Swift version: 5.3.2

Checklist

• If possible, I've reproduced the issue using the main branch of this package
• I've searched for existing GitHub issues

Steps to Reproduce

1. Checkout main branch
2. Add any @Option or @Flag to the Math struct
3. Build the project with swift build
4. Run math add --help

Sample:

struct Math: ParsableCommand {

    static var configuration = CommandConfiguration(
        ...
    )

    @Option(help: "Test option.")
    var test: String?

}

Expected behavior

Help of the subcommand only should be printed, options of the main command should not be printed

Sample:

OVERVIEW: Print the sum of the values.

USAGE: math add [--hex-output] [<values> ...]

ARGUMENTS:
  <values>                A group of integers to operate on. 

OPTIONS:
  -x, --hex-output        Use hexadecimal notation for the result. 
  --version               Show the version.
  -h, --help              Show help information.

Actual behavior

• Overview, usage, arguments of the subcommand are being printed ✅
• Options of the subcommand are being printed ✅
• Options of the main command are being printed ❌

Sample:

OVERVIEW: Print the sum of the values.

USAGE: math add [--hex-output] [<values> ...]

ARGUMENTS:
  <values>                A group of integers to operate on. 

OPTIONS:
  --test <test>           Test option. 
  -x, --hex-output        Use hexadecimal notation for the result. 
  --version               Show the version.
  -h, --help              Show help information.