Fix build error if PINDA_THERMISTOR is not defined

temp_cal_active variable is not defined in this scope

Firmware/Marlin_main.cpp

@@ -3103,7 +3103,7 @@ static void gcode_G80()
     bool magnet_elimination = (eeprom_read_byte((uint8_t*)EEPROM_MBL_MAGNET_ELIMINATION) > 0);
 
 #ifndef PINDA_THERMISTOR
-    if (run == false && temp_cal_active == true && calibration_status_pinda() == true && target_temperature_bed >= 50)
+    if (run == false && eeprom_read_byte((uint8_t *)EEPROM_TEMP_CAL_ACTIVE) && calibration_status_pinda() == true && target_temperature_bed >= 50)
     {
         temp_compensation_start();
         run = true;
@@ -3337,7 +3337,7 @@ static void gcode_G80()
     //		SERIAL_ECHOLNPGM("clean up finished ");
 
 #ifndef PINDA_THERMISTOR
-    if(temp_cal_active == true && calibration_status_pinda() == true) temp_compensation_apply(); //apply PINDA temperature compensation
+    if(eeprom_read_byte((uint8_t *)EEPROM_TEMP_CAL_ACTIVE) && calibration_status_pinda() == true) temp_compensation_apply(); //apply PINDA temperature compensation
 #endif
     babystep_apply(); // Apply Z height correction aka baby stepping before mesh bed leveing gets activated.
     //		SERIAL_ECHOLNPGM("babystep applied");