Refactor usage of PLR_BED_THRESHOLD

Author: vovodroid

Marlin/Configuration_adv.h

@@ -1744,7 +1744,9 @@
   //#define POWER_LOSS_RECOVERY
   #if ENABLED(POWER_LOSS_RECOVERY)
     #define PLR_ENABLED_DEFAULT       false // Power Loss Recovery enabled by default. (Set with 'M413 Sn' & M500)
-    //#define PLR_BED_THRESHOLD BED_MAXTEMP // (°C) Skip user confirmation at or above this bed temperature (0 to disable)
+    #if TEMP_SENSOR_BED
+      #define PLR_BED_THRESHOLD           0 // (°C) Skip user confirmation at or above this bed temperature (0 to disable)
+    #endif
     //#define BACKUP_POWER_SUPPLY           // Backup power / UPS to move the steppers on power loss
     //#define POWER_LOSS_ZRAISE           2 // (mm) Z axis raise on resume (on power loss with UPS)
     //#define POWER_LOSS_PIN             44 // Pin to detect power loss. Set to -1 to disable default pin on boards without module.

Marlin/src/inc/Conditionals_adv.h

@@ -1357,6 +1357,6 @@
 #endif
 
 // Power-Loss Recovery
-#if ENABLED(POWER_LOSS_RECOVERY) && defined(PLR_BED_THRESHOLD)
+#if defined(PLR_BED_THRESHOLD)
   #define HAS_PLR_BED_THRESHOLD 1
 #endif