remote: fix driver name check for libxl driver

The virConnectGetType() returns "Xen" for libxl, not "LIBXL".

This prevents users opening a connection to the libxl driver when using
the modular daemons.
Reviewed-by: NJim Fehlig <jfehlig@suse.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/remote/remote_daemon_dispatch.c

@@ -2111,7 +2111,7 @@ remoteDispatchConnectOpen(virNetServerPtr server G_GNUC_UNUSED,
 
     VIR_DEBUG("Primary driver type is '%s'", type);
     if (STREQ(type, "QEMU") ||
-        STREQ(type, "LIBXL") ||
+        STREQ(type, "Xen") ||
         STREQ(type, "LXC") ||
         STREQ(type, "VBOX") ||
         STREQ(type, "bhyve") ||