FS-5682 --resolve there was one other change to allow them to copy over by…

FS-5682 --resolve there was one other change to allow them to copy over by setting them on the A leg.  Exporting the sip_multipart variable or setting it in {} on the dial string should already work.  This patch should make it work with setting it too.

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -5252,7 +5252,7 @@ static switch_call_cause_t sofia_outgoing_channel(switch_core_session_t *session
 		}
 
 		if (!(vval = switch_channel_get_variable(o_channel, "sip_copy_multipart")) || switch_true(vval)) {
-			switch_ivr_transfer_variable(session, nsession, SOFIA_MULTIPART_PREFIX_T);
+			switch_ivr_transfer_variable(session, nsession, "sip_multipart");
 		}
 		switch_ivr_transfer_variable(session, nsession, "sip_video_fmtp");
 		switch_ivr_transfer_variable(session, nsession, "sip-force-contact");