MEDIUM: stconn: merge the app_ops and the data_cb fields

For historical reasons (stream-interface and connections), we used to
require two independent fields for the application level callbacks and
the transport-level functions. Over time the distinction faded away so
much that the low-level functions became specific to the application
and conversely. For example, applets may only work with streams on top
since they rely on the channels, and the stream-level functions differ
between applets and connections. Right now the application level only
contains a wake() callback and the low-level ones contain the functions
that act at the lower level to perform the shutr/shutw and at the upper
level to notify about readability and writability. Let's just merge them
together into a single set and get rid of this confusing distinction.
Note that the check ops do not define any app-level function since these
are only called by streams.
diff --git a/src/mux_quic.c b/src/mux_quic.c
index e0036c0..9b37d05 100644
--- a/src/mux_quic.c
+++ b/src/mux_quic.c
@@ -1594,8 +1594,8 @@
 				qcs_notify_recv(qcs);
 				qcs_notify_send(qcs);
 			}
-			else if (qcs->endp->sc->data_cb->wake) {
-				qcs->endp->sc->data_cb->wake(qcs->endp->sc);
+			else if (qcs->endp->sc->app_ops->wake) {
+				qcs->endp->sc->app_ops->wake(qcs->endp->sc);
 			}
 		}
 	}