NS1: fix ALIAS handling (#1154)

A bug was introduced in a2042c2eda, which stoped ALIAS records
from setting their record type correctly (it was set to nil).

Specifically, case "ALIAS" doesn't fall through to any of the other cases
below, leading ALIAS records to set their type to nil.

To fix that, readd the code that got absorbed by the URLFWD in a2042c2eda.

providers/ns1/ns1provider.go

@@ -90,6 +90,7 @@ func (n *nsone) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correct
 	// each name/type is given to the api as a unit.
 	for k, descs := range changedGroups {
 		key := k
+
 		desc := strings.Join(descs, "\n")
 		_, current := foundGrouped[k]
 		recs, wanted := desiredGrouped[k]
@@ -165,6 +166,10 @@ func convert(zr *dns.ZoneRecord, domain string) ([]*models.RecordConfig, error)
 		rec.SetLabelFromFQDN(zr.Domain, domain)
 		switch rtype := zr.Type; rtype {
 		case "ALIAS":
+			rec.Type = rtype
+			if err := rec.SetTarget(ans); err != nil {
+				panic(fmt.Errorf("unparsable %s record received from ns1: %w", rtype, err))
+			}
 		case "URLFWD":
 			rec.Type = rtype
 			if err := rec.SetTarget(ans); err != nil {