CommentsUtil: Remove unused code for deleting drafts
CommentsUtil: Remove unused code for deleting drafts

Drafts are deleted in NoteDbUpdateManager#doDelete.

Change-Id: Ie3e0421d6827403b76914297a07267f596c26de6

qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit