G76 Fix probe height and position

[Tor-p]

Fix probe height for heating which had got lost during code cleanup.
Also added Z_SAFE_HOMING support

Requirements

A z probe with a temperature sensor

Description

When heating the z probe it should be at 0.5 millimeter. This had gotten lost during code cleanup.
It now also respects Z_SAFE_HOMING.
I also changed the config for PTC_MAX_BED_TEMP to BED_MAXTEMP - 10 since that is the highest thermalManager.setTargetBed alows

Benefits

G76 now works

Related Issues

[thinkyhead]

If the user wants to wait-for-heatup and probe at the same point where safe homing occurs, they should set PTC_PROBE_POS_X and PTC_PROBE_POS_Y to that point. There's no reason to override their choice in the case of safe homing.

[thisiskeithb]

What about removing PTC_MAX_BED_TEMP from Configuration_adv.h all together and use the value from BED_MAXTEMP?

I don't understand the use case where those would need to be different.

[thinkyhead]

The PTC_MAX_BED_TEMP was added specifically so that it could be set separately. Someone wants it.

[thisiskeithb]

The PTC_MAX_BED_TEMP was added specifically so that it could be set separately. Someone wants it.

Sort of. I think the @tompe-proj just wanted to make sure it was set correctly:

Could this be derived from MAX_BED_TEMP?

Yes, assuming users set MAX_BED_TEMP correctly in firmware, i.e. the bed can actually reach that temperature. Otherwise they will run into temperature errors while calibrating

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