Merqury inputs should use database+assembly (fasta, not fastq)

[stephenturner]

Merqury inputs should include the meryl db (created from reads), and the assembly.

genomeqc/modules/nf-core/merqury/merqury/main.nf

Lines 11 to 12 in 5e5f897

	input:
	tuple val(meta), path(meryl_db), path(assembly)

Typo in the current implementation that joins to the reads (fasta), not the assembly.

genomeqc/workflows/genomeqc.nf

Lines 127 to 129 in 5e5f897

	ch_meryl_union
	| join(ch_fastq)
	| set {ch_merqury_inputs}

Need to change this to fasta, not fastq.

Also need to change this in the subworkflow nf-core/modules#6905