[ImgBot] Optimize images

*Total -- 775.61kb -> 647.51kb (16.52%)

/Remove_POS_hindi_text/Input.png -- 107.92kb -> 67.24kb (37.69%)
/Remove_POS_hindi_text/Output.png -- 181.47kb -> 115.34kb (36.44%)
/Watermark Maker(On Image)/test_image.jpg -- 153.10kb -> 144.49kb (5.63%)
/Watermark Maker(On Image)/Test_Image2.png -- 325.37kb -> 312.71kb (3.89%)
/Num-Plate-Detector/car.jpeg -- 7.75kb -> 7.74kb (0.13%)

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

Author: ImgBotApp