🩹 Improve and apply XATC reset() (#23840)

Marlin/src/feature/x_twist.cpp

 #if ENABLED(X_AXIS_TWIST_COMPENSATION)
 
 #include "x_twist.h"
+#include "../module/probe.h"
 
 XATC xatc;
 
-bool XATC::enabled = true;
+bool XATC::enabled;
 float XATC::spacing, XATC::start;
 xatc_array_t XATC::z_offset; // Initialized by settings.load()
 
 void XATC::reset() {
   constexpr float xzo[] = XATC_Z_OFFSETS;
   static_assert(COUNT(xzo) == XATC_MAX_POINTS, "XATC_Z_OFFSETS is the wrong size.");
-  enabled = false;
   COPY(z_offset, xzo);
+  xatc.spacing = (probe.max_x() - probe.min_x()) / (XATC_MAX_POINTS - 1);
+  xatc.start = probe.min_x();
+  enabled = true;
 }
 
 void XATC::print_points() {

Marlin/src/lcd/menu/menu_x_twist.cpp

   }
 
   if (ui.use_click()) {
-    xatc.spacing = (probe.max_x() - probe.min_x()) / (XATC_MAX_POINTS - 1);
-    xatc.start = probe.min_x();
+    xatc.reset();
 
     SET_SOFT_ENDSTOP_LOOSE(true); // Disable soft endstops for free Z movement