Predheat. Not Reading Flow Difference Target from apps.yaml

[broeky]

Describe the bug
there is a typo in Predheat which means that the Flow Difference Target is defaulting to 20.
Expected behaviour
to correctly read the apps.yaml flow_different_target

Predbat version

8.6.1 main

Environment details

Heat Pump.

Screenshots

check line 517 in predheat. self.flow_difference_target = self.get_arg("float_difference_target", 20.0, domain="predheat")

Log file

[springfall2008]

Fixed on main, will release soon