clear error on upload field

[Liviu]

Hi,

Think it's a bug, on Field Upload if we have an error on the field, the error will not be cleared when an upload will be  successful, for this to work i think it should be added in atk4-uploader.js in uploadComplete method the line at the begging of the method:

$(this.options.form).atk4_form('clearError', this.element);

[Liviu]

 I have made a pull request on GIT with the change.

https://github.com/atk4/atk4/pull/601

[Romans Malinovskis]

Thanks, Merged.