When in RTL mode (e.g. enabled via SAL_RTL_ENABLED=1),
translate/invert the X value as needed when retrieving/setting
it for the ColorFieldControl.
Otherwise, the position is horizontally inverted/mirrored
as described in tdf#173418 in the custom LO color chooser
dialog (e.g. clicking at the color at the right edge sets the
color that's at the left edge).
Change-Id: Ifd3e5b93aab4e8f3cf8ed72f0bedab652e9cb1e6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/211458
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>