Finished workshop button shown when workshop instructions are not iframed.

[GrahamDumpleton]

Describe the bug

If the workshop instructions are popped out into a separate window by using menu item "Open Workshop", the last page of the instructions still show a "Finish Workshop" button, but which doesn't do anything if clicked. This is when testing with Hugo page renderer. The button likely should not be shown at all in this case.

Additional information

No response