libobs: Raise max number of output encoders to 10

libobs/obs-output.h

@@ -34,7 +34,7 @@ extern "C" {
 #define OBS_OUTPUT_MULTI_TRACK_AV (OBS_OUTPUT_MULTI_TRACK_AUDIO | OBS_OUTPUT_MULTI_TRACK_VIDEO)
 
 #define MAX_OUTPUT_AUDIO_ENCODERS 6
-#define MAX_OUTPUT_VIDEO_ENCODERS 6
+#define MAX_OUTPUT_VIDEO_ENCODERS 10
 
 struct encoder_packet;