EventsPage: fix "Edit Event Comment" when photo selected
The "Edit Event Comment" button in the event context menu currently triggers the same
on_edit_comment
function as the "Edit Comment" button in the photo context menu.
As described in #4929 (closed), clicking "Edit Event Comment" with a photo selected thus
edits that photo's comment rather than the event comment.
This MR creates a separate on_edit_event_comment
function for "Edit Event Comment"
and changes on_edit_comment
to handle only the photo context menu's "Edit Comment."
This allows editing of both photo and event comments to work as expected.
Fixes #4929 (closed)