Implement NO_MOTION_BEFORE_HOMING option

Marlin/src/gcode/bedlevel/G42.cpp

@@ -33,7 +33,7 @@
  * G42: Move X & Y axes to mesh coordinates (I & J)
  */
 void GcodeSuite::G42() {
-  if (IsRunning()) {
+  if (MOTION_CONDITIONS) {
     const bool hasI = parser.seenval('I');
     const int8_t ix = hasI ? parser.value_int() : 0;
     const bool hasJ = parser.seenval('J');