Qemu error when attempting to start Guest

Migrated from: https://github.com/tobimensch/aqemu/issues/136

> Error [#1](https://github.com/tobimensch/aqemu/issues/1) qemu-system-x86_64: -spice port=5930,disable-ticketing: warning: short-form boolean option 'disable-ticketing' deprecated Please use disable-ticketing=on instead
> 
> Any suggestions?

