[ImgBot] Optimize images

*Total -- 84.18kb -> 67.99kb (19.24%)

/icons/Reddit_Logo.png -- 78.31kb -> 63.02kb (19.52%)
/icons/Matrix_logo.svg.png -- 5.88kb -> 4.96kb (15.53%)

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

Author: ImgBotApp