[MM-48921] Don't return error when deleting Draft if Draft DNE (#21818)

* set global drafts feature flag to true

* Don't return error on deleteDraft when draft doesn't exist in server

* undo accidental feature flag change

* address comments

* change log level to debug

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/draft.go

@@ -25,7 +25,7 @@ func (a *App) GetDraft(userID, channelID, rootID string) (*model.Draft, *model.A
 		var nfErr *store.ErrNotFound
 		switch {
 		case errors.As(err, &nfErr):
-			return nil, model.NewAppError("GetDraft", "app.draft.get.app_error", nil, nfErr.Error(), http.StatusNotFound)
+			return nil, model.NewAppError("GetDraft", "app.draft.get.app_error", nil, err.Error(), http.StatusNotFound)
 		default:
 			return nil, model.NewAppError("GetDraft", "app.draft.get.app_error", nil, err.Error(), http.StatusInternalServerError)
 		}