fix(devices): treat matching device commands as spurious updates
fix(devices): treat matching device commands as spurious updates

The logic in devices.isSpuriousUpdate was incorrectly failing to negate
a boolean condition, meaning that matching device commands were being
treated as non-spurious. This change fixes that so they are deemed
spurious instead.

mozilla/fxa-auth-server,mozilla/fxa-auth-server,mozilla/fxa-auth-server,mozilla/fxa-auth-server