Don't raise Z if only homing Z

Marlin/Marlin_main.cpp

@@ -2914,7 +2914,8 @@ inline void gcode_G28() {
 
     #elif defined(MIN_Z_HEIGHT_FOR_HOMING) && MIN_Z_HEIGHT_FOR_HOMING > 0
 
-      // Raise Z before homing, if specified
+      // Raise Z before homing X or Y, if specified
+      if (home_all_axis || homeX || homeY) {
         float z_dest = home_offset[Z_AXIS] + MIN_Z_HEIGHT_FOR_HOMING;
         if (z_dest > current_position[Z_AXIS]) {
 
@@ -2936,6 +2937,7 @@ inline void gcode_G28() {
 
           destination[Z_AXIS] = current_position[Z_AXIS] = z_dest;
         }
+      }
 
     #endif // MIN_Z_HEIGHT_FOR_HOMING