Fix G29 missing defines (#21145)

Co-authored-by: ellensp <ellensp@hotmsil.com>

Marlin/src/module/probe.cpp

@@ -335,14 +335,6 @@ FORCE_INLINE void probe_specific_action(const bool deploy) {
       #define PROBING_BED_TEMP 0
     #endif
   #endif
-  #if ENABLED(PREHEAT_BEFORE_LEVELING)
-    #ifndef LEVELING_NOZZLE_TEMP
-      #define LEVELING_NOZZLE_TEMP 0
-    #endif
-    #ifndef LEVELING_BED_TEMP
-      #define LEVELING_BED_TEMP 0
-    #endif
-  #endif
 
   /**
    * Do preheating as required before leveling or probing.

Marlin/src/module/probe.h

@@ -44,6 +44,15 @@
   #define PROBE_TRIGGERED() (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING)
 #endif
 
+#if ENABLED(PREHEAT_BEFORE_LEVELING)
+  #ifndef LEVELING_NOZZLE_TEMP
+    #define LEVELING_NOZZLE_TEMP 0
+  #endif
+  #ifndef LEVELING_BED_TEMP
+    #define LEVELING_BED_TEMP 0
+  #endif
+#endif
+
 class Probe {
 public: