refactor(validationRenderer): check the data-show-errortext attribute to show the message for the date picker validation error.
refactor(validationRenderer): check the data-show-errortext attribute to show the message for the date picker validation error.

I have added the validation for date picker but I have forgot to make some test on the remove and I have added the ability to add a data attribute to the date picker so I have adapt the code so the validation renderer can be able to display or not the message according to the attribute.

aurelia-ui-toolkits/aurelia-materialize-bridge,aurelia-ui-toolkits/aurelia-materialize-bridge,aurelia-ui-toolkits/aurelia-materialize-bridge