Fix the `berry` command to call proper `Validate()` function

The `berry` command incorrectly calls `ValidateTypesArgs()`. 

A `ValidateBerryArgs()` function doesn't currently exist.

New function in `v1.7.3`:

```go
func ValidateBerryArgs(args []string) error {
	if err := checkLength(args, 3); err != nil {
		return err
	}

	if err := checkNoOtherOptions(args, 3, "<types>"); err != nil {
		return err
	}

	return nil
}
```