Determine probe trigger position using offsets

Intead of using the position of the toolhead, determine the probe
trigger point using the probe offsets and randomization range.

Author: voidtrance

src/core/objects/probe.c

@@ -91,9 +91,9 @@ static void probe_update(core_object_t *object, uint64_t ticks,
         if (!probe->axis_valid[i])
             continue;
 
-        probe->position[i] =
-            ((double *)&status.position)[i] + probe->offsets[i];
-        probe->triggered &= ((double *)&status.position)[i] <= probe->range;
+        probe->position[i] = *(((double *)&status.position) + i) + probe->offsets[i];
+        probe->triggered &= (probe->position[i] >= (probe->offsets[i] - probe->range)) &&
+                            (probe->position[i] <= (probe->offsets[i] + probe->range));
     }
 
     probe->pin_word = !!probe->triggered;