Fix auto-power in PID autotune (#19119)

Marlin/src/module/temperature.cpp

     SERIAL_ECHOLNPGM(STR_PID_AUTOTUNE_START);
 
     disable_all_heaters();
+    TERN_(AUTO_POWER_CONTROL, powerManager.power_on());
 
     SHV(bias = d = (MAX_BED_POWER) >> 1, bias = d = (PID_MAX) >> 1);
 
       LEDColor color = ONHEATINGSTART();
     #endif
 
-    TERN_(AUTO_POWER_CONTROL, powerManager.power_on());
     TERN_(NO_FAN_SLOWING_IN_PID_TUNING, adaptive_fan_slowing = false);
 
     // PID Tuning loop