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/delta_calibrate.cfg

@@ -3,7 +3,8 @@
 step_pin: ar54
 dir_pin: ar55
 enable_pin: !ar38
-step_distance: .000100
+microsteps: 16
+rotation_distance: 0.32
 endstop_pin: ^ar2
 homing_speed: 50
 #position_endstop: 297.05
@@ -13,14 +14,16 @@ homing_speed: 50
 step_pin: ar60
 dir_pin: ar61
 enable_pin: !ar56
-step_distance: .000100
+microsteps: 16
+rotation_distance: 0.32
 endstop_pin: ^ar15
 
 [stepper_c]
 step_pin: ar46
 dir_pin: ar48
 enable_pin: !ar62
-step_distance: .000100
+microsteps: 16
+rotation_distance: 0.32
 endstop_pin: ^ar19
 
 [mcu]