Change STAR mapping failure string

[drpatelh]

Will need to change the description in the line below to something like "poor mapping percentage (<5%)". Alignment scores do actually exist but they are used to represent the quality of the mapping of individual reads. Best not to mix up the two.

rnaseq/main.nf

Line 1652 in ae59ed2

log.info "${c_purple}[nf-core/rnaseq]${c_red} WARNING - ${skipped_poor_alignment.size()} samples skipped due to poor alignment scores!${c_reset}"

[apeltzer]

x-ref #296