Allow DELTA to compile with soft endstops disabled

Marlin/src/module/motion.cpp

@@ -1357,12 +1357,14 @@ void homeaxis(const AxisEnum axis) {
 
     #if ENABLED(DELTA)
       switch(axis) {
+        #if HAS_SOFTWARE_ENDSTOPS
           case X_AXIS:
           case Y_AXIS:
             // Get a minimum radius for clamping
             soft_endstop_radius = MIN3(FABS(max(soft_endstop_min[X_AXIS], soft_endstop_min[Y_AXIS])), soft_endstop_max[X_AXIS], soft_endstop_max[Y_AXIS]);
             soft_endstop_radius_2 = sq(soft_endstop_radius);
             break;
+        #endif
         case Z_AXIS:
           delta_clip_start_height = soft_endstop_max[axis] - delta_safe_distance_from_top();
         default: break;