msglist [nfc]: Comment on a color that's the same in web between light/dark

Author: chrisbobbe

lib/widgets/message_list.dart

@@ -453,7 +453,8 @@ class ScrollToBottomButton extends StatelessWidget {
  tooltip: "Scroll to bottom",
  icon: const Icon(Icons.expand_circle_down_rounded),
  iconSize: 40,
- color: const HSLColor.fromAHSL(0.5,240,0.96,0.68).toColor(),
+ // Web has the same color in light and dark mode.
+ color: const HSLColor.fromAHSL(0.5, 240, 0.96, 0.68).toColor(),
  onPressed: _navigateToBottom));
  }
 }