fix DADA2 tracking table

[d4straub]

Closes #1020.

AI writes:
# Align columns by merging on the normalised sample key instead of cbind'ing
# independently (re)sorted columns. The old positional cbind shifted rows when a
# sample name was a full prefix of another sample name (e.g. EQUIP_BLANK / EQUIP_BLANK_3_25_2026),
# mis-labelling the denoised/merged/nonchim read counts in the HTML report.

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