config: Update bigtreetech-skr-mini-e3 to be more similar to ender3 config

The SKR mini E3 is marketed as being for the Ender 3, so it makes
sense for the example electronics config to be more similar to the
Ender 3 config.

Reported by @TheDogee.

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

config/generic-bigtreetech-skr-mini-e3.cfg

@@ -13,12 +13,12 @@
 
 [stepper_x]
 step_pin: PB13
-dir_pin: PB12
+dir_pin: !PB12
 enable_pin: !PB14
-step_distance: .0025
-endstop_pin: ^!PC0
+step_distance: .0125
+endstop_pin: ^PC0
 position_endstop: 0
-position_max: 200
+position_max: 235
 homing_speed: 50
 
 [tmc2209 stepper_x]
@@ -32,12 +32,12 @@ stealthchop_threshold: 250
 
 [stepper_y]
 step_pin: PB10
-dir_pin: PB2
+dir_pin: !PB2
 enable_pin: !PB11
-step_distance: .0025
-endstop_pin: ^!PC1
+step_distance: .0125
+endstop_pin: ^PC1
 position_endstop: 0
-position_max: 200
+position_max: 235
 homing_speed: 50
 
 [tmc2209 stepper_y]
@@ -53,10 +53,10 @@ stealthchop_threshold: 250
 step_pin: PB0
 dir_pin: PC5
 enable_pin: !PB1
-step_distance: .0125
-endstop_pin: ^!PC2
-position_endstop: 0.5
-position_max: 200
+step_distance: .0025
+endstop_pin: ^PC2
+position_endstop: 0.0
+position_max: 250
 
 [tmc2209 stepper_z]
 uart_pin: PC11
@@ -69,18 +69,18 @@ stealthchop_threshold: 5
 
 [extruder]
 step_pin: PB3
-dir_pin: PB4
+dir_pin: !PB4
 enable_pin: !PD2
-step_distance: .002
+step_distance: 0.010526
 nozzle_diameter: 0.400
 filament_diameter: 1.750
 heater_pin: PC8
 sensor_type: EPCOS 100K B57560G104F
 sensor_pin: PA0
 control: pid
-pid_Kp: 22.2
-pid_Ki: 1.08
-pid_Kd: 114
+pid_Kp: 21.527
+pid_Ki: 1.063
+pid_Kd: 108.982
 min_temp: 0
 max_temp: 250
 
@@ -97,7 +97,10 @@ stealthchop_threshold: 5
 heater_pin: PC9
 sensor_type: ATC Semitec 104GT-2
 sensor_pin: PC3
-control: watermark
+control: pid
+pid_Kp: 54.027
+pid_Ki: 0.770
+pid_Kd: 948.182
 min_temp: 0
 max_temp: 130