Update README.md (#537)

remove duplicate youtube link

README.md

@@ -327,7 +327,6 @@ https://github.com/danielgatis/rembg/issues/193#issuecomment-1055534289
 - https://www.youtube.com/watch?v=3xqwpXjxyMQ
 - https://www.youtube.com/watch?v=dFKRGXdkGJU
 - https://www.youtube.com/watch?v=Ai-BS_T7yjE
-- https://www.youtube.com/watch?v=dFKRGXdkGJU
 - https://www.youtube.com/watch?v=D7W-C0urVcQ
 
 ## References