Fixed issue with update rules not using existing resource

[marcoboers]

This PR fixes an issue with the update rules when using the TabsOnEdit trait on a resource.
The TabsOnEdit trait currently breaks validation rules that rely on the model when updating the model.

Example of a case that is fixed by this PR:

Text::make(__('Number'),  'number')
    ->rules([
        'required', 
        'integer', 
        Rule::unique('modules')
            ->ignoreModel($this->resource),
    ]),

[RVxLab]

Thanks for the PR, much appreciated!

I'll tag a release tonight.

[marcoboers]

Thank you for your fast response!