The --base command option for the `snapcraft help` command no longer works
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Issue body
It can't even run the example command in the `snapcraft help` commands's help text:
```
$ snapcraft help help
Usage: snapcraft help [OPTIONS] <topic>
Examples:
snapcraft help go --base core18
Options:
--base [core18|core20] Show help for specific base
$ snapcraft help go --base core18
Usage: snapcraft [options] command [args]...
Try 'snapcraft -h' for help.
Error: Too many parameters when requesting help; pass a command (optionally with --format), '--all', or leave it empty
```
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