Removed unused (depracated) input variable

[tomasbackman]

PR o'clock

Description

Removed an old leftover input variable no longer used.
For backwards compatibility it could instead be used for "prefix" in access_logs variable, but personally I think that would just make it more confusing.

Checklist

• terraform fmt and terraform validate both work from the root and examples/alb_test_fixture directories (look in CI for an example)
• [-] Tests for the changes have been added and passing (for bug fixes/features)
• [-] Test results are pasted in this PR (in lieu of CI)
• [- Not mentioned in docs] Docs have been added/updated (for bug fixes/features)
• [v] Any breaking changes are noted in the description above

[antonbabenko]

Thank you for this pull-request, @tomasbackman !

[github-actions]

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