fdo#83289 (part) help btn for impress photo album

Help button in Impress Photo Album dialog

Change-Id: Id21a29955036ed74ee9b66be8c076ecf81f25a17
Reviewed-on: https://gerrit.libreoffice.org/11211
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>