fix: argument name order mismatch with tests in rna_transcription.pl

[anarcal]

The following tests imply that the second argument is an RNA sequence, since only RNA has U base pairs. All the tests work if you just swap the initial order of the arguments, and implement the conversion correctly.

    test(rna_complement_of_adenine_is_uracil, condition(pending)) :-
        rna_transcription("A", Result),
        Result == "U".

    test(rna_complement, condition(pending)) :-
        rna_transcription("ACGTGGTCTTAA", Result),
        Result == "UGCACCAGAAUU".

[github-actions]

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