Revert removal of comment box for Event Update
Revert removal of comment box for Event Update

This fixes #1653 by showing the comment box for event update.
The comment box will be used for automatic comment made by the "Update from URL"
function.

pbanaszkiewicz/amy,swcarpentry/amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy,swcarpentry/amy,swcarpentry/amy