Restore original Sparkle icon.

This reverts: 984aac852f45d34a7fa22c4e63930047a7891de9,
93ebf843c2b896c4ee0222bea669602a49f922fe,
8d2054e62a1df873f4fd5ccc64f2b12d94f807e5,
1325d3fe40addf019ff94f3f23314eb8589a50b9,
2579f2c3a34172d368df8c87a59e45ee417a394c,
and partially reverts 6ca5c3a3379e2bc7f7a8967c9e91fefb29cf438c.

This icon belongs to a third party and should never have been merged.