rtmp-services: Change YouTube keyint from 4 to 2

YouTube recommends a keyframe interval of 2 seconds with a maximum
interval of 4 seconds.

plugins/rtmp-services/data/package.json

 {
 	"url": "https://obsproject.com/obs2_update/rtmp-services",
-	"version": 40,
+	"version": 41,
 	"files": [
 		{
 			"name": "services.json",
-			"version": 40
+			"version": 41
 		}
 	]
 }

plugins/rtmp-services/data/services.json

@@ -131,7 +131,7 @@
                 }
             ],
             "recommended": {
-                "keyint": 4,
+                "keyint": 2,
                 "profile": "main",
                 "max video bitrate": 18000,
                 "max audio bitrate": 160