tdf#136555 drop custom start center button colors

Custom button text or background colors don't play nice with any
complex theming. Maybe we should still allow a custom background
color for the button bar, but probably that attempt is also futile
and clashes with theming easily.

As long as the botton bar uses themable push-buttons as a control
custom coloring will break at some point, as these buttons can
have too many states, which curently depend on the theme. There is
no way for LO to know, if a roll-over button will return with a
different backround or just some changed border from a themed
paint call.

So this reverts the button part of tdf#90452. It doesn't affect
the preview area, as that is a custom widget, which doesn't use
any theming, but has it's own setting - for better or worse.

Change-Id: I1ef17a50d15a5876a11bce89ae3f764aa91f66bc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/103041
Tested-by: Jenkins
Tested-by: Heiko Tietze <heiko.tietze@documentfoundation.org>
Reviewed-by: Heiko Tietze <heiko.tietze@documentfoundation.org>
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>

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