qmp: hide "hotplugged" device property from device-list-properties

The "hotplugged" device property was not reported before commit
f4eb32b5 ("qmp: show QOM properties in
device-list-properties").  Fix this difference.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

qmp.c

@@ -509,6 +509,7 @@ DevicePropertyInfoList *qmp_device_list_properties(const char *typename,
         if (strcmp(prop->name, "type") == 0 ||
             strcmp(prop->name, "realized") == 0 ||
             strcmp(prop->name, "hotpluggable") == 0 ||
+            strcmp(prop->name, "hotplugged") == 0 ||
             strcmp(prop->name, "parent_bus") == 0) {
             continue;
         }