[rom_e2e] check actual BFVs in `sigverify_always` test
[rom_e2e] check actual BFVs in `sigverify_always` test

Prior test didn't check the actual values.

Signed-off-by: Timothy Trippel <77eacc84f9735d3cbb55a271710be269fc3a5818@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan