builtin set_color: remove obsolete comment

"set_color normal --bold" does set the bold modifier since commit cebc05f6c1
(Reset is not a color, 2025-04-15), so this comment no longer applies.

src/builtins/set_color.rs

@@ -148,7 +148,6 @@ pub fn set_color(parser: &Parser, streams: &mut IoStreams, argv: &mut [&wstr]) -
 
     // Here's some automagic behavior: if either of foreground or background are "normal",
     // reset all colors/attributes. Same if foreground is "reset" (undocumented).
-    // Note that either overwrite the attributes printed above! For "normal", this is probably wrong?
     if is_reset || [fg, bg].iter().any(|c| c.is_some_and(|c| c.is_normal())) {
         outp.reset_text_face();
     } else {