headless: improve popup menu background defaults.

Change-Id: Icda7df363827e1942486c961bf9eef9402aba96c
Reviewed-on: https://gerrit.libreoffice.org/46123Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

vcl/headless/svpframe.cxx

@@ -411,6 +411,8 @@ void SvpSalFrame::UpdateSettings( AllSettings& rSettings )
 
     Color aBackgroundColor( 0xec, 0xec, 0xec );
     aStyleSettings.BatchSetBackgrounds( aBackgroundColor, false );
+    aStyleSettings.SetMenuColor( aBackgroundColor );
+    aStyleSettings.SetMenuBarColor( aBackgroundColor );
 
     if (comphelper::LibreOfficeKit::isActive()) // TODO: remove this.
     {