Fix: Ensure --version flag works correctly for cargo stylus

[joewnga]

Fixes #54. The changes ensure that running cargo stylus—-version outputs the expected version information instead of returning the help message.

Also, resolved a minor issue with the duplication of the command check alias c.

Checklist

• I have documented these changes where necessary.
• I have read the DCO and ensured that these changes comply.
• I assign this work under its open source licensing.

[joewnga]

@rauljordan kindly review. Thanks!