HIG-ify conditional format dialog + help button

* Add help button to contitional format dialog
* HIG-ify with frames

Change-Id: Iea34bc7b6b14f26d8eb29557610baa7160238c5d
Reviewed-on: https://gerrit.libreoffice.org/11078
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>
HIG-ify Cond. format manager + Help button

* Add help button to Conditional format manager
* HIG-ify with frame

Change-Id: I54a77a8e33a9bbbc1dd9b64cb4997a21c2e1a318
Reviewed-on: https://gerrit.libreoffice.org/11079
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>