Delete confirmation doesn't work nice in combination with content lock

Problem/Motivation

When content lock module is enabled and an article is locked for editing, then all action elements that can change content are disabled. The problem here is that a custom remove confirmation dialog button doesn't take in account that base remove button is disabled.

Proposed resolution

We should add same logic as we have for add in between buttons, where we check if the base action element is disabled and simply transfer that state to elements added by javascript.