fix: Netbox Boolean custom fields take a Boolean type value

Netbox will accept the previous Integer values but they will be stored
as Integers and not casted to Boolean. This breaks the web UI (which
will show undefined) and anything that queries the API expecting a
Boolean type as an Integer will be returned.

netbox/util.go

@@ -246,9 +246,9 @@ func convertCustomFieldsFromTerraformToAPI(stateCustomFields []interface{}, cust
 			toReturn[cfName] = cfValueInt
 		} else if cfType == CustomFieldBoolean {
 			if cfValue == "true" {
-				toReturn[cfName] = 1
+				toReturn[cfName] = true
 			} else if cfValue == "false" {
-				toReturn[cfName] = 0
+				toReturn[cfName] = false
 			}
 		} else if cfType == "multiple" {
 			cfValueArray := strings.Split(cfValue, ",")