fix ignored G53

[tomjnixon]

issue was introduced in fc0d9d3

without this, the "perform motion" check ignores the command

i'm not sure if this is the right approach, but it works and seems to make sense

[Paciente8159]

Thanks. I think that will arise other problems but I will check it out.

Edit:
Nevermind. Looks good. Thanks

[tomjnixon]

thanks!