terminal/style: compare packed styles directly, no cast needed

Woohoo, Zig 0.14!

src/terminal/style.zig

@@ -87,10 +87,9 @@ pub const Style = struct {
 
     /// True if the style is equal to another style.
     pub fn eql(self: Style, other: Style) bool {
-        const packed_self = PackedStyle.fromStyle(self);
-        const packed_other = PackedStyle.fromStyle(other);
-        // TODO: in Zig 0.14, equating packed structs is allowed. Remove this work around.
-        return @as(u128, @bitCast(packed_self)) == @as(u128, @bitCast(packed_other));
+        // 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);
     }
 
     /// Returns the bg color for a cell with this style given the cell