fix default interval to be the intended value (#700)

Co-authored-by: Simon Aronsson <simme@arcticbit.se>

internal/flags/flags.go

@@ -300,11 +300,11 @@ Should only be used for testing.`)
 
 // SetDefaults provides default values for environment variables
 func SetDefaults() {
-	day := time.Hour * 24
+	day := (time.Hour * 24).Seconds()
 	viper.AutomaticEnv()
 	viper.SetDefault("DOCKER_HOST", "unix:///var/run/docker.sock")
 	viper.SetDefault("DOCKER_API_VERSION", DockerAPIMinVersion)
-	viper.SetDefault("WATCHTOWER_POLL_INTERVAL", day.Seconds())
+	viper.SetDefault("WATCHTOWER_POLL_INTERVAL", day)
 	viper.SetDefault("WATCHTOWER_TIMEOUT", time.Second*10)
 	viper.SetDefault("WATCHTOWER_NOTIFICATIONS", []string{})
 	viper.SetDefault("WATCHTOWER_NOTIFICATIONS_LEVEL", "info")