Tests Fail on Boolean Format

[GerryG]

This must be a golang version thing, but in settings*_test.go it is try to fmt.Errorf with booleans formatted with %d. I had to replace them with %t to work.

My go version is: go version go1.10.1 linux/amd64

I'm guessing this must have changed with some go version that isn't that widespread yet.