chan_pjsip: Ignore AST_CONTROL_STREAM_TOPOLOGY_CHANGED for now

chan_pjsip_indicate was missing a case for the recently added
AST_CONTROL_STREAM_TOPOLOGY_CHANGED condition and was returning an
error and causing the call to be hung up instead of just ignoring
it.

ASTERISK-27260
Reported by: Daniel Heckl

Change-Id: I4fecbb00a0b8a853da85155065c1a6bddf235e80

channels/chan_pjsip.c

@@ -1738,6 +1738,8 @@ static int chan_pjsip_indicate(struct ast_channel *ast, int condition, const voi
 		topology = data;
 		res = handle_topology_request_change(channel->session, topology);
 		break;
+	case AST_CONTROL_STREAM_TOPOLOGY_CHANGED:
+		break;
 	case -1:
 		res = -1;
 		break;