[Libreoffice-ux-advise] Remove option to hide the scrollbars

Hi UX advise, Nico, Raphael,

Regarding:

https://bugs.freedesktop.org/show_bug.cgi?id=35427

and the particularly helpful screenshot

https://bugs.freedesktop.org/attachment.cgi?id=44847

The report describes a bug that a setting that used to work does not
work any more.  My concern is that this setting shouldn't exist at all,
in the first place ;-)  The setting is "Tools -> Options... ->
LibreOffice Writer -> View -> View -> Horizontal / Vertical scrollbar".

https://bugs.freedesktop.org/attachment.cgi?id=44611

I'd like to turn the original bug report into an EasyHack to actually
remove these settings for good (and hide the scrollbars when they are
not necessary, as it is happening now) TOGETHER with decreasing the
amount of the situations when the scrollbars appear.

It seems that it is unnecessary to have the minimal page margin
(referenced in the first screenshot) as big as shown there.  Anything
else here comes to your mind we can shrink, to decrease the amount of
situations when the scrollbars appear to bare minimum?

Thank you,
Kendy