Fix CodeCoverage pipeline (#16684)
### Description
<!-- Describe your changes. -->
Delete second reference to onnxruntime_api_tests_without_env in the code
coverage commands. One was removed in #16373 and the duplicate wasn't
noticed.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Fix pipeline.
