update help message

[sunkickr]

Description

update help message to not say -1 but to say 0. In the past we haven't found a way to test cmd.Flags().Changed()

🎟 Issue(s)

• https://github.com/astronomer/astro-cli/issues/1349

🧪 Functional Testing

List the functional testing steps to confirm this feature or fix.

📸 Screenshots

Add screenshots to illustrate the validity of these changes.

📋 Checklist

• [ ] Rebased from the main (or release if patching) branch (before testing)
• [ ] Ran make test before taking out of draft
• [ ] Ran make lint before taking out of draft
• [ ] Added/updated applicable tests
• [ ] Tested against Astro-API (if necessary).
• [ ] Tested against Houston-API and Astronomer (if necessary).
• [ ] Communicated to/tagged owners of respective clients potentially impacted by these changes.
• [ ] Updated any related documentation

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.57%. Comparing base (6b79c3d) to head (460dc2d). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1609 +/- ## ======================================= Coverage 86.57% 86.57% ======================================= Files 114 114 Lines 15944 15946 +2 ======================================= + Hits 13804 13806 +2 Misses 1284 1284 Partials 856 856 ```

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[sunkickr]

tested manually

[sunkickr]

I added a temporary print statement to show that the PR is working. In the first screenshot the min worker count is not changed so the print statement shows the min count was changed to -1. In the second screenshot the min worker count is 0 so there is no print statement and the min worker count stays 0