R1:f1222f956a85

Correctly clear draft markers when deleting an inline comment

Summary:
Fixes T8917. Prior to T2618, deleting inlines prompted users, then really deleted the rows.

After T2618, we delete immediately and offer "Undo". However, some interactions with drafts were missed, and we were only clearing the "this revision has a draft" flag on one of the delete pathways (when you delete all the comment text, then save the comment).

Make both the "Delete" action and the "Delete All Comment Text + Save" workflows do…