Update return action validate to match database

In oc_return_action `name` is varchar(64)

https://github.com/ADDCreative/opencart/commit/95a1ec76aaa77397b7126894fd2b42e52bd82043

https://github.com/ADDCreative/opencart/commit/e0a660578f92164e5f7f7931a3cfd4befb3d76ea