approved-for-ci-run.yml: fix ci-run/pr-* branch deletion

[bayandin]

Problem

ci-run/pr-* branches (and attached PRs) should be deleted automatically when their parent PRs get closed.
But there are not

Summary of changes

• Fix condition

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[github-actions]

1644 tests run: 1569 passed, 0 failed, 75 skipped (full report)

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Flaky tests (2)

Postgres 14

• test_download_remote_layers_api[local_fs]: release
• test_get_tenant_size_with_multiple_branches: release

Code coverage (full report)

• functions: 53.1% (7605 of 14334 functions)
• lines: 81.4% (44751 of 54962 lines)

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_{The comment gets automatically updated with the latest test results
7c966ef at 2023-09-11T15:05:12.206Z :recycle:}