exchanges: improves GetDefaultConfig method (#1245)

* exchanges: Add function to get standard config

* exchanges: add tests (cherry-pick here and above)

* after pick stuff

* cleanup

---------

Co-authored-by: Ryan O'Hara-Reid <ryan.oharareid@thrasher.io>

exchanges/exmo/exmo_wrapper.go

@@ -31,12 +31,12 @@ import (
 // GetDefaultConfig returns a default exchange config
 func (e *EXMO) GetDefaultConfig(ctx context.Context) (*config.Exchange, error) {
 	e.SetDefaults()
-	exchCfg := new(config.Exchange)
-	exchCfg.Name = e.Name
-	exchCfg.HTTPTimeout = exchange.DefaultHTTPTimeout
-	exchCfg.BaseCurrencies = e.BaseCurrencies
+	exchCfg, err := e.GetStandardConfig()
+	if err != nil {
+		return nil, err
+	}
 
-	err := e.SetupDefaults(exchCfg)
+	err = e.SetupDefaults(exchCfg)
 	if err != nil {
 		return nil, err
 	}