HIG fixes for svx

* Standardize spacing
* Add missing colons to labels that precede controls (fdo#78826)
* Disable manual resizing where it doesn’t make sense
* Standardize Help button’s position (fdo#76486)
* Remove unhelpful frames

Change-Id: I53ffb47fbd4da62e92341ced3772c2d1ee83e0f8
Reviewed-on: https://gerrit.libreoffice.org/12260
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>