Restore declarations of G53-G59 (#13654)

Marlin/src/gcode/geometry/G53-G59.cpp

@@ -59,7 +59,7 @@ bool GcodeSuite::select_coordinate_system(const int8_t _new) {
  *
  * Marlin also uses G53 on a line by itself to go back to native space.
  */
-inline void GcodeSuite::G53() {
+void GcodeSuite::G53() {
   const int8_t _system = active_coordinate_system;
   active_coordinate_system = -1;
   if (parser.chain()) { // If this command has more following...