Compare fields directly instead of PackedStyle

Comparing the fields directly is actually faster than PackedStyle

src/terminal/style.zig

@@ -85,9 +85,10 @@ pub const Style = struct {
 
     /// True if the style is equal to another style.
     pub fn eql(self: Style, other: Style) bool {
-        // We convert the styles to packed structs and compare as integers
-        // because this is much faster than comparing each field separately.
-        return PackedStyle.fromStyle(self) == PackedStyle.fromStyle(other);
+        return @as(u16, @bitCast(self.flags)) == @as(u16, @bitCast(other.flags)) and
+               std.meta.eql(self.fg_color, other.fg_color) and
+               std.meta.eql(self.bg_color, other.bg_color) and
+               std.meta.eql(self.underline_color, other.underline_color);
     }
 
     /// Returns the bg color for a cell with this style given the cell