Fix testing of runaway options in temperature.cpp

Marlin/temperature.cpp

   int current_raw_filwidth = 0;  //Holds measured filament diameter - one extruder only
 #endif  
 
-#if THERMAL_PROTECTION_HOTENDS || THERMAL_PROTECTION_BED
+#if defined(THERMAL_PROTECTION_HOTENDS) || defined(THERMAL_PROTECTION_BED)
   enum TRState { TRReset, TRInactive, TRFirstHeating, TRStable, TRRunaway };
   void thermal_runaway_protection(TRState *state, millis_t *timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc);
-  #if THERMAL_PROTECTION_HOTENDS
+  #ifdef THERMAL_PROTECTION_HOTENDS
     static TRState thermal_runaway_state_machine[4] = { TRReset, TRReset, TRReset, TRReset };
     static millis_t thermal_runaway_timer[4]; // = {0,0,0,0};
   #endif
-  #if THERMAL_PROTECTION_BED
+  #ifdef THERMAL_PROTECTION_BED
     static TRState thermal_runaway_bed_state_machine = TRReset;
     static millis_t thermal_runaway_bed_timer;
   #endif
   // Loop through all extruders
   for (int e = 0; e < EXTRUDERS; e++) {
 
-    #if THERMAL_PROTECTION_HOTENDS
+    #ifdef THERMAL_PROTECTION_HOTENDS
       thermal_runaway_protection(&thermal_runaway_state_machine[e], &thermal_runaway_timer[e], current_temperature[e], target_temperature[e], e, THERMAL_PROTECTION_PERIOD, THERMAL_PROTECTION_HYSTERESIS);
     #endif
 
 
   #if TEMP_SENSOR_BED != 0
   
-    #if THERMAL_PROTECTION_BED
+    #ifdef THERMAL_PROTECTION_BED
       thermal_runaway_protection(&thermal_runaway_bed_state_machine, &thermal_runaway_bed_timer, current_temperature_bed, target_temperature_bed, -1, THERMAL_PROTECTION_BED_PERIOD, THERMAL_PROTECTION_BED_HYSTERESIS);
     #endif
 
   }
 #endif
 
-#if THERMAL_PROTECTION_HOTENDS || THERMAL_PROTECTION_BED
+#if defined(THERMAL_PROTECTION_HOTENDS) || defined(THERMAL_PROTECTION_BED)
 
   void thermal_runaway_protection(TRState *state, millis_t *timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc) {