[connector/routing] Fix configuration error with request context

Remove a residual fallthrough keyword

Fixes #37410

Author: vlaborie

connector/routingconnector/config.go

@@ -76,7 +76,6 @@ func (c *Config) Validate() error {
 			if _, err := parseRequestCondition(item.Condition); err != nil {
 				return err
 			}
-			fallthrough
 		default:
 			return errors.New("invalid context: " + item.Context)
 		}