4084 make draft deletion time more visible.

https://code.google.com/p/otwarchive/issues/detail?id=4084
This should be a p, not an h5, if we're applying the caution and notice classes, since those classes are only intended for divs and paragraphs. It would probably also be more at home in the works/work_module partial, around line 48 (between the symbols block and the tag block), since we already have a pattern of displaying notices there on other types of works (e.g. http://test.archiveofourown.org/external_works/22348/bookmarks)