Revert "extract_signatures: Enforce NMF's "seed" generic is active when running NMF."
Revert "extract_signatures: Enforce NMF's "seed" generic is active when running NMF."

This reverts commit 3e321e8d3f2f69088dded7b8a4d3de57caf0e478.

CuppenResearch/MutationalPatterns