Minimum temp options for Probing and G12 Nozzle Clean (#20383)

Co-authored-by: Jason Smith <jason.inet@gmail.com>
Co-authored-by: Scott Lahteine <github@thinkyhead.com>

Marlin/src/inc/Conditionals_LCD.h

@@ -819,6 +819,22 @@
       #define TOTAL_PROBING MULTIPLE_PROBING
     #endif
   #endif
+  #if ENABLED(PREHEAT_BEFORE_PROBING)
+    #ifndef PROBING_NOZZLE_TEMP
+      #define PROBING_NOZZLE_TEMP 0
+    #endif
+    #ifndef PROBING_BED_TEMP
+      #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
 #else
   // Clear probe pin settings when no probe is selected
   #undef Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN