test: Update test case to not use pin_map

Remove all users of the pin_map setting.

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

test/klippy/pwm.cfg

@@ -1,12 +1,12 @@
 [output_pin soft_pwm_pin]
-pin: ar8
+pin: PH5
 pwm: True
 value: 0
 shutdown_value: 0
 cycle_time: 0.01
 
 [output_pin hard_pwm_pin]
-pin: ar9
+pin: PH6
 pwm: True
 hardware_pwm: True
 value: 0
@@ -15,7 +15,6 @@ cycle_time: 0.01
 
 [mcu]
 serial: /dev/ttyACM0
-pin_map: arduino
 
 [printer]
 kinematics: none