Bug 1867707 Add comments and details block header active state

Moved styles to the right path for active states to been seen when
a block's add comments/details opens up a modal.

- added in more specific target to folder_render_in_modal to prevent
the wrong event being called on open_modal func

behatnotneeded

Change-Id: I78d647e44f938de432a4757b309bca7caae3adcb
(cherry picked from commit 01cab2e4)