config: Update generic-creality-v4.2.7.cfg (Klipper3d#6790)

Corrected Filament Runout Sensor Pin (as per schematic - see https://github.com/LeeOtts/Ender3v2-Klipper-Configs/blob/main/Creality.4.2.7.-.Schematic.28-5-22-1.pdf )

Signed-off-by: John Minor <theminor@duck.com>

Author: theminor

config/generic-creality-v4.2.7.cfg

@@ -95,4 +95,4 @@ max_z_accel: 100
 aliases:
   EXP1_1=PC6,EXP1_3=PB10,EXP1_5=PB14,EXP1_7=PB12,EXP1_9=<GND>,
   EXP1_2=PB2,EXP1_4=PB11,EXP1_6=PB13,EXP1_8=PB15,EXP1_10=<5V>,
-  PROBE_IN=PB0,PROBE_OUT=PB1,FIL_RUNOUT=PC6
+  PROBE_IN=PB0,PROBE_OUT=PB1,FIL_RUNOUT=PA4