🔧 Move SOFT_PWM_SCALE fallback to cpp (#25800)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/module/temperature.cpp

@@ -3479,6 +3479,10 @@ void Temperature::isr() {
 
   static int8_t temp_count = -1;
   static ADCSensorState adc_sensor_state = StartupDelay;
+
+  #ifndef SOFT_PWM_SCALE
+    #define SOFT_PWM_SCALE 0
+  #endif
   static uint8_t pwm_count = _BV(SOFT_PWM_SCALE);
 
   // Avoid multiple loads of pwm_count

Marlin/src/module/temperature.h

@@ -41,10 +41,6 @@
   #include "../feature/fancheck.h"
 #endif
 
-#ifndef SOFT_PWM_SCALE
-  #define SOFT_PWM_SCALE 0
-#endif
-
 #define HOTEND_INDEX TERN(HAS_MULTI_HOTEND, e, 0)
 #define E_NAME TERN_(HAS_MULTI_HOTEND, e)