Use specified color for non-highlighted text in HighlightedLabel (#3509)

This PR fixes an issue where the specified color for a
`HighlightedLabel` was not respected as the default color for
non-highlighted text.

Release Notes:

- N/A

crates/ui2/src/components/stories/label.rs

@@ -23,5 +23,9 @@ impl Render for LabelStory {
                 "Héllo, world!",
                 vec![0, 1, 3, 8, 9, 13],
             ))
+            .child(Story::label("Highlighted with `color`"))
+            .child(
+                HighlightedLabel::new("Hello, world!", vec![0, 1, 2, 7, 8, 12]).color(Color::Error),
+            )
     }
 }