optimise klicky when doing bed mesh during start print

[pellcorp]

So if we are doing homing and a bed mesh in start print ideally we want to attach the probe to do the homing, but leave it attached for bed mesh and only then dock it after the bed mesh. There really is no need to dock immediately after homing.

I reckon this was the way it used to work and I broke it.

[pellcorp]

So if the printer is homed in start_end.cfg, we likely want to manually attach before homing and having sensorless.cfg be sensitive to an existing attached probe and so not try and attach again, and we would need to have some kind of state in sensorless.cfg to know if we had attached the probe as part of homing.

[pellcorp]

Right now, there is very little chance of me getting to look at this in 2025, I would happily take merge requests though.

[pellcorp]

https://github.com/pellcorp/creality/tree/jp_klicky_dock_refinement

Likely I can refine this further now that START_PRINT=1 is being passed to bed mesh calibrate, so instead of trying to keep track of state I can just respect the START_PRINT=1, so the branch I was working on perhaps can be refined at some point. Alas Ive no time for this any time soon, my K1 can't even properly mount a klicky cos the plastic holes were stripped out and stuffed up putting in inserts, so my first job would be to slightly remix the mount to fix my crooked holes!