fix(rebaseWhen): text in PR for new branches with automerge=true

[PhilipAbed]

Changes

update the rebaseWhen value even when branches needs creating.

changes are just moving the transform rebaseWhen function above few rows.

Context

in case
automerge=true
the PR text results in:
🚦 Automerge: Enabled.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

This is not what the documentation says,
after investigating it appears to be only a text issue,
as when rebasing an existing PR the rebasing is handled.

after fix result:
🚦 Automerge: Enabled.
♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 38.135.3 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 38.135.3

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