[ImgBot] Optimize images

*Total -- 4,566.04kb -> 4,304.11kb (5.74%)

/cleaner.when.lol.png -- 292.20kb -> 140.07kb (52.06%)
/cancer.when.lol.png -- 340.49kb -> 254.86kb (25.15%)
/when.lol.jpg -- 76.84kb -> 68.83kb (10.42%)
/aniwhen.lol.gif -- 3,856.51kb -> 3,840.35kb (0.42%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp