[LyX/master] Adapt listings label color for darkmode

[Jürgen Spitzmüller]

commit fcbbb138a26ceea890d0cebbacbf20a84d3210bf
Author: Jürgen Spitzmüller <spitz at lyx.org>
Date:   Thu Sep 21 07:11:07 2023 +0200

    Adapt listings label color for darkmode
    
    Do not use semantic foreground color here, as label button color does
    not change in dark mode.
---
 lib/layouts/stdinsets.inc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/layouts/stdinsets.inc b/lib/layouts/stdinsets.inc
index 6fab49c..764fbff 100644
--- a/lib/layouts/stdinsets.inc
+++ b/lib/layouts/stdinsets.inc
@@ -361,7 +361,7 @@ InsetLayout Listings
 	  Family              typewriter
 	EndFont
 	LabelFont
-	  Color               foreground
+	  Color               black
 	  Size                Small
 	EndFont
 	BgColor               listingsbg