Fix progress bar feedback when generating customers via WP-CLI

[thetwopct]

All Submissions:

• Have you followed the Contributing guidelines?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

When generating customers via WP-CLI the plugin incorrectly states that coupons are being generated before the progress bar.

This PR fixes the text feedback for the progress bar.

How to test the changes in this Pull Request:

1. Run wp-cli command wp wc generate customers 1
2. Check the feedback given on screen

Changelog entry

Fixes progress bar feedback when generating customers via WP-CLI

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[coreymckrill]

Arg, thank you for catching that copy pasta mistake!