Actions for disabled resources can be triggered via keyboard

[JammingBen]

Describe the bug

Actions for disabled resources can be triggered via keyboard when navigating via tab and then pressing enter.

Steps to reproduce

1. Upload a resource
2. Disable that resource (can be done via code by returning true here: https://github.com/owncloud/web/blob/master/packages/web-pkg/src/components/FilesList/ResourceTable.vue#L549)
3. Tab through the table
4. As soon as you reach the pencil icon behind the resource name, press enter

Expected behavior

The action should not be focusable.

Actual behavior

The action can be focussed and performed. The same goes for the quick actions.