LibraryElements: replaces `is_folder=1` usages with correct dialect string (#34453)

pkg/services/libraryelements/database.go

@@ -660,7 +660,7 @@ func (l *LibraryElementService) deleteLibraryElementsInFolderUID(c *models.ReqCo
 		var folderUIDs []struct {
 			ID int64 `xorm:"id"`
 		}
-		err := session.SQL("SELECT id from dashboard WHERE uid=? AND org_id=? AND is_folder=1", folderUID, c.SignedInUser.OrgId).Find(&folderUIDs)
+		err := session.SQL("SELECT id from dashboard WHERE uid=? AND org_id=? AND is_folder=?", folderUID, c.SignedInUser.OrgId, l.SQLStore.Dialect.BooleanStr(true)).Find(&folderUIDs)
 		if err != nil {
 			return err
 		}