[FHI72] Fix long PRACH format

Teodora Vladićrequested to merge
fix-prach-diff-mu into develop

The problem was that xran_is_prach_slot() compared if the current slot is the scheduled one. However, this becomes irrelevant if long PRACH format used.

Successfully tested end-to-end the PRACH index 7 with TDD DDDDDDDSUU and Benetel v2.0.5.

Edited by Teodora Vladić

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