To trigger this dialog: Sheet -> Show Sheet...

Change-Id: I501d9444ef9798a26b4db06ab51e4fb691144b17
Reviewed-on: https://gerrit.libreoffice.org/51094Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Henry Castro <hcastro@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/51095Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>