Who guessed String ordering would depend on Swift version? Fix a test so that it runs in both Swift 4.1 and Swift 4.2
Who guessed String ordering would depend on Swift version? Fix a test so that it runs in both Swift 4.1 and Swift 4.2

groue/GRDB.swift,groue/GRDB.swift,groue/GRDB.swift,groue/GRDB.swift