[ImgBot] Optimize images

*Total -- 38.57kb -> 25.47kb (33.95%)

/logos/tv/nrwision.png -- 20.49kb -> 10.13kb (50.58%)
/logos/tv/seenluft24.png -- 11.34kb -> 8.81kb (22.3%)
/logos/tv/rbtv.png -- 6.74kb -> 6.54kb (2.98%)

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