ScSpecialFilterDlg by default does not lock the table, but in tiled
rendering case, switching sheets are locked when the dialog is closed

Thanks Michael Meeks for debugging

Change-Id: Ifa32fd63085f3e082b97ad0313dff7b826b95d2e
Reviewed-on: https://gerrit.libreoffice.org/72074Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>