FS-9214: fix 3pcc behavior

Fix callflow issues with  3pcc=true and 3pcc=proxy and interactions with sip_wait_for_aleg_ack
removes passthrough of 183 on 3pcc=proxy (that was previously not functioning)

src/mod/endpoints/mod_sofia/mod_sofia.h

@@ -344,6 +344,7 @@ typedef enum {
 	TFLAG_REINVITED,
 	TFLAG_PASS_ACK,
 	TFLAG_KEEPALIVE,
+	TFLAG_SKIP_EARLY,
 	/* No new flags below this line */
 	TFLAG_MAX
 } TFLAGS;