placeholder code left in .gitignore after configure

[mogmarsh]

Description of the bug

After running configure, the following is still at the top of the .gitignore file:

# BEGIN DELETE AFTER INSTALL #
composer.lock
# END DELETE AFTER INSTALL #

Steps To Reproduce

Run php configure.php
Check .gitignore file

Additional Information

No response

[srtfisher]

Was applied to create-wordpress-plugin but also needs to be applied to create-wordpress-project.