Revert "FS-9303 add CONF_VIDEO_MODE_NONE so we don't default to CONF_VIDEO_MODE_PASSTHROUGH"

This reverts commit 7150cede.

src/mod/applications/mod_conference/mod_conference.c

@@ -2401,7 +2401,7 @@ conference_obj_t *conference_new(char *name, conference_xml_cfg_t cfg, switch_co
 	char *video_letterbox_bgcolor = NULL;
 	char *video_codec_bandwidth = NULL;
 	char *no_video_avatar = NULL;
-	conference_video_mode_t conference_video_mode = CONF_VIDEO_MODE_NONE;
+	conference_video_mode_t conference_video_mode = CONF_VIDEO_MODE_PASSTHROUGH;
 	int conference_video_quality = 1;
 	int auto_kps_debounce = 30000;
 	float fps = 30.0f;

src/mod/applications/mod_conference/mod_conference.h

@@ -522,8 +522,7 @@ typedef struct conference_record {
 typedef enum {
 	CONF_VIDEO_MODE_PASSTHROUGH,
 	CONF_VIDEO_MODE_TRANSCODE,
-	CONF_VIDEO_MODE_MUX,
-	CONF_VIDEO_MODE_NONE
+	CONF_VIDEO_MODE_MUX
 } conference_video_mode_t;
 
 /* Conference Object */