tests/qemuxml2xmltest: remove NOP call of virQEMUCapsSetList

Commit 5572cd7f deprecated QEMU_CAPS_DEVICE capability but forgot
to remove this call as well.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

tests/qemuxml2xmltest.c

@@ -254,9 +254,6 @@ testInfoSet(struct testInfo *info,
     if (!(info->qemuCaps = virQEMUCapsNew()))
         goto error;
 
-    virQEMUCapsSetList(info->qemuCaps,
-                       QEMU_CAPS_LAST);
-
     if (testQemuCapsSetGIC(info->qemuCaps, gic) < 0)
         goto error;