fix: restore Dark Modern preformat foreground

Author: joyceerhl

extensions/theme-defaults/themes/dark_modern.json

@@ -113,7 +113,7 @@
 		"textCodeBlock.background": "#2B2B2B",
 		"textLink.activeForeground": "#4daafc",
 		"textLink.foreground": "#4daafc",
-		"textPreformat.foreground": "#D0D0D0",
+		"textPreformat.foreground": "#D7BA7D",
 		"textPreformat.background": "#3C3C3C",
 		"textSeparator.foreground": "#21262D",
 		"titleBar.activeBackground": "#181818",