fix: match expected input for bwa/mem (no fai) using map. updated tes…

[piplus2]

PR checklist

Closes #11548

• This comment contains a description of changes (with reason).
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The test now passes the expected arguments for BWA_INDEX (no fai).
For the workflow, the expected input is passed to BWA_MEM using .map. To do so, the test must pass a channel.value as expected by the workflow.
Also the snapshots are updated to reconcile with the new test.

[mashehu]

Suggested change

	ch_fasta = ch_fasta_fai.map { it -> tuple(it[0], it[1]) }
	ch_fasta = ch_fasta_fai.map { file -> tuple(file[0], file[1]) }

just to make it clearer that we are not using the old syntax 🙂