utils: do not return SXPLAYER_PIXFMT_MEDIACODEC when getting AV_PIX_FMT_RGBA
utils: do not return SXPLAYER_PIXFMT_MEDIACODEC when getting AV_PIX_FMT_RGBA

Stupeflix/sxplayer,Stupeflix/sxplayer,Stupeflix/sxplayer