t27b: re-bless the expectations ledger from lab run 26c447ad8 #6320

Refs #6063

The t27b expectations ledger (docs/reports/t27b_expectations.json) was last blessed at 88862a9. Against lab run 26c447a, tri t27b ratchet is red: UNEXPECTED PASS 452, UNLISTED 12, MOVED 79, UNEXPECTED FAILURE 0. Every finding is a coverage gain from the lanes merged since (#6247 .. #6316), not a regression.

Fix: tri t27b ratchet --bless from that run (pass 307, pass_vacuous 271, not_pass 142, max_not_pass 142); the ratchet is green afterwards.