Fix latency signal emission sequence when using JACK

Capture latency needs to be updated before playback latency,
various internal parts depend on this order (which is also
the default for libjack itself).

libs/ardour/audioengine.cc

@@ -308,12 +308,12 @@ AudioEngine::process_callback (pframes_t nframes)
 		}
 		if (lp || lc) {
 			tm.release ();
-			if (lp) {
-				_session->update_latency (true);
-			}
 			if (lc) {
 				_session->update_latency (false);
 			}
+			if (lp) {
+				_session->update_latency (true);
+			}
 			tm.acquire ();
 		}
 	}