Bugfix: [homing_heaters] not working with heater_generic

[whyme12]

Module: heaters: [homing_heaters] not working with heater_generic.

Currently the heater in [homing_heaters] has to be set as heater_generic my_heater
while on a homing or probing move it is checked for the heater name my_heater,
which can't be found.
With this fix, the config check requires my_heater to be defined which matches the later
check when homing or probing
As far as I can tell, no impact on other things, as get_all_heaters() is only used in homing_heaters.py.

Signed-off-by: Robin Ehnert [email protected]

[github-actions]

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