SAK-25969 refactor resources dropzone to use dropzone 3.8.4 custom js which makes fewer changes to the upstream dropzone js

git-svn-id: https://source.sakaiproject.org/svn/content/trunk@307595 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-25969 modernerzer was accidentally removed due to a merge conflict

git-svn-id: https://source.sakaiproject.org/svn/content/trunk@307600 66ffb92e-73f9-0310-93c1-f5514f145a0a