test: Update test cases to use rotation_distance

Remove all users of step_distance from test configs.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

test/klippy/bltouch.cfg

@@ -3,7 +3,8 @@
 step_pin: ar54
 dir_pin: ar55
 enable_pin: !ar38
-step_distance: .0125
+microsteps: 16
+rotation_distance: 40
 endstop_pin: ^ar3
 position_endstop: 0
 position_max: 200
@@ -13,7 +14,8 @@ homing_speed: 50
 step_pin: ar60
 dir_pin: !ar61
 enable_pin: !ar56
-step_distance: .0125
+microsteps: 16
+rotation_distance: 40
 endstop_pin: ^ar14
 position_endstop: 0
 position_max: 200
@@ -23,7 +25,8 @@ homing_speed: 50
 step_pin: ar46
 dir_pin: ar48
 enable_pin: !ar62
-step_distance: .0025
+microsteps: 16
+rotation_distance: 8
 endstop_pin: probe:z_virtual_endstop
 position_max: 200
 
@@ -31,7 +34,8 @@ position_max: 200
 step_pin: ar26
 dir_pin: ar28
 enable_pin: !ar24
-step_distance: .002
+microsteps: 16
+rotation_distance: 33.5
 nozzle_diameter: 0.400
 filament_diameter: 1.750
 heater_pin: ar10