* Add Z Fade Height to M420 Output
Echo the z-fade height when M420 is called, if it is enabled.
* Fix Whitespace
* Fix Compiler complaint
* Missing semi-colon
When both lowering and recovery are performed using the same "prepare_move_to_destination()" the extruder recovery feedrate ends up being ignored and, instead, is only capped by either the maximum e-speed or the time it takes to perform the z-lowering.
Performing the two moves separately from each other ensures a correct recovery feedrate.