tdf#152622 Fix color of Object Boundaries in dark mode

In the "LibreOffice" color scheme (the light one) the color used for Text Boundaries and Object Boundaries is the same.

This patch makes it so that in the "LibreOffice Dark" scheme these colors are the same as well.

This is important to better highlight objects over a dark background, which was the case reported in the bug ticket. In Impress the object boundaries were not visible because the color used is too dark.

Change-Id: I31e2876b14bca10fcf2c077da46e4541bb9f3ca4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/145800
Tested-by: Jenkins
Reviewed-by: Heiko Tietze <heiko.tietze@documentfoundation.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

officecfg/registry/data/org/openoffice/Office/UI.xcu

@@ -459,7 +459,7 @@
             <value>true</value>
           </prop>
           <prop oor:name="Color">
-            <value>1842204</value>
+            <value>8421504</value>
           </prop>
         </node>
         <node oor:name="TableBoundaries">