Make leveling_is_active a macro

Marlin/src/gcode/calibrate/G28.cpp

@@ -157,7 +157,7 @@ void GcodeSuite::G28(const bool always_home_all) {
   // Disable the leveling matrix before homing
   #if HAS_LEVELING
     #if ENABLED(AUTO_BED_LEVELING_UBL)
-      const bool ubl_state_at_entry = leveling_is_active();
+      const bool ubl_state_at_entry = LEVELING_IS_ACTIVE();
     #endif
     set_bed_leveling_enabled(false);
   #endif

Marlin/src/gcode/calibrate/M48.cpp

@@ -32,6 +32,10 @@
   #include "../../feature/bedlevel/bedlevel.h"
 #endif
 
+#if HAS_LEVELING
+  #include "../../module/planner.h"
+#endif
+
 /**
  * M48: Z probe repeatability measurement function.
  *
@@ -115,7 +119,7 @@ void GcodeSuite::M48() {
   // Disable bed level correction in M48 because we want the raw data when we probe
 
   #if HAS_LEVELING
-    const bool was_enabled = leveling_is_active();
+    const bool was_enabled = LEVELING_IS_ACTIVE();
     set_bed_leveling_enabled(false);
   #endif