`calculate_rm_cost` skipped rate refresh whenever `bom_creator` was set,
so neither the Update Cost button nor the BOM Update Tool could ever
refresh those BOMs. Every BOM in a multi-level tree carries the field, so
whole trees stayed frozen at their creation rates.
The guard replaced the removed `rm_cost_as_per == "Manual"` check in
0b63dbf, on the assumption that BOM Creator rows hold manual rates. They
do not: BOM Creator recomputes every row from `rm_cost_as_per` on save.
(cherry picked from commit d269c90838)
# Conflicts:
# erpnext/manufacturing/doctype/bom/services/costing.py
8037ddf80c