Update sa.m3u

Added SBC channel from https://github.com/iptv-org/iptv/issues/1989#issuecomment-766361103

channels/sa.m3u

@@ -67,3 +67,5 @@ https://shls-rotanamusic-prod-dub.shahid.net/out/v1/edfe0095261648908a3a931b7248
 https://shls-rotanaplus-prod-dub.shahid.net/out/v1/1fc6103458be480b96e6a574b00fe1c0/index.m3u8
 #EXTINF:-1 tvg-id="" tvg-name="" tvg-language="Arabic" tvg-logo="https://i.imgur.com/SMk1hAy.png" group-title="",Saudi TV 1 (360p)
 https://cdnamd-hls-globecast.akamaized.net/live/ramdisk/saudi_tv/hls1/saudi_tv.m3u8
+#EXTINF:-1 tvg-id="" tvg-name="" tvg-language="Arabic" tvg-logo="" group-title="",SBC (1080p)
+https://iptv--iptv.repl.co/Arabic/SBC