ITBit: Fix fatal error on second run

This fix removes incorrect config pair delimiter, because it would be
re-inserted into config the first run, and then error the second time.

This delimiter doesn't match the config we have.
There's no implementation of fetching pairs, so what's in config files
now is all that matters

exchanges/itbit/itbit_wrapper.go

@@ -61,7 +61,7 @@ func (i *ItBit) SetDefaults() {
 	i.API.CredentialsValidator.RequiresSecret = true
 
 	requestFmt := &currency.PairFormat{Uppercase: true}
-	configFmt := &currency.PairFormat{Uppercase: true, Delimiter: currency.DashDelimiter}
+	configFmt := &currency.PairFormat{Uppercase: true}
 	err := i.SetGlobalPairsManager(requestFmt, configFmt, asset.Spot)
 	if err != nil {
 		log.Errorln(log.ExchangeSys, err)