make it so when you put someone on hold and then they attended transfer you, the resulting bridge will still be playing hold music

src/include/switch_types.h

@@ -1255,6 +1255,7 @@ typedef enum {
 	CF_NO_CDR,
 	CF_EARLY_OK,
 	CF_MEDIA_TRANS,
+	CF_HOLD_ON_BRIDGE,
 	/* WARNING: DO NOT ADD ANY FLAGS BELOW THIS LINE */
 	/* IF YOU ADD NEW ONES CHECK IF THEY SHOULD PERSIST OR ZERO THEM IN switch_core_session.c switch_core_session_request_xml() */
 	CF_FLAG_MAX