Problem:

Comment field's Wiki Style renderer is not consistent. If there's a file attached on the issue, the Attachment button is available. However, when there's no attachment, the Wiki Style renderer will not show the Attachment button.

Steps to Reproduce:

1. Create a Screen and associate it to a transition
2. Transition an issue and observe the screens that will pop up
3. If there's an existing file attached on the issue before transitioning the ticket, the Attachment button in the Comment field's Wiki Style renderer is there.
4. If no attachment is uploaded on the issue prior to transitioning the issue, the button is missing.

Expected behaviour:
The attachment button in the Wiki Style Renderer should be consistently present regardless of a file is attached on the issue or not.

Actual Behaviour:
It seems that the appearance of the Attachment button in the Wiki Style Renderer of Comment field depends on the presence/absence of a file in the ticket