Fix single use formatting and error messages

e2e/singleUse/mac.go

e2e/singleUse/mac_test.go

e2e/singleUse/recipientID.go

e2e/singleUse/recipientID_test.go

e2e/singleUse/responseFingerprint.go

e2e/singleUse/responseFingerprint_test.go

e2e/singleUse/responseKey.go

e2e/singleUse/responseKey_test.go

e2e/singleUse/tagFingerprint.go

e2e/singleUse/tagFingerprint_test.go

e2e/singleUse/transmitFingerprint.go

e2e/singleUse/transmitFingerprint_test.go

e2e/singleUse/transmitKey.go

e2e/singleUse/transmitKey_test.go