[ImgBot] Optimize images

*Total -- 72.33kb -> 61.12kb (15.49%)

/logos/radio/rbbInforadio.png -- 10.18kb -> 8.06kb (20.86%)
/logos/tv/tvingolstadt.png -- 15.80kb -> 12.62kb (20.12%)
/logos/radio/radioq.png -- 19.68kb -> 16.23kb (17.53%)
/logos/radio/koelncampus.png -- 18.62kb -> 16.34kb (12.24%)
/logos/radio/lunico.png -- 8.04kb -> 7.87kb (2.09%)

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