lcd_put_wchar_max for COLOR_UI (#20838)

Co-Authored-By: Victor Oliveira <github@victormo.com.br>

Marlin/src/inc/SanityCheck.h

   #error "FILAMENT_CHANGE_LOAD_LENGTH is now FILAMENT_CHANGE_FAST_LOAD_LENGTH."
 #elif defined(LEVEL_CORNERS_INSET)
   #error "LEVEL_CORNERS_INSET is now LEVEL_CORNERS_INSET_LFRB."
-#elif ENABLED(LEVEL_BED_CORNERS) && !defined(LEVEL_CORNERS_INSET_LFRB)
-  #error "LEVEL_BED_CORNERS requires LEVEL_CORNERS_INSET_LFRB values."
-#elif BOTH(LEVEL_CORNERS_USE_PROBE, SENSORLESS_PROBING)
-  #error "LEVEL_CORNERS_USE_PROBE is incompatible with SENSORLESS_PROBING."
 #elif defined(BEZIER_JERK_CONTROL)
   #error "BEZIER_JERK_CONTROL is now S_CURVE_ACCELERATION."
 #elif HAS_JUNCTION_DEVIATION && defined(JUNCTION_DEVIATION_FACTOR)
 
 #endif
 
+#if ENABLED(LEVEL_BED_CORNERS)
+  #ifndef LEVEL_CORNERS_INSET_LFRB
+    #error "LEVEL_BED_CORNERS requires LEVEL_CORNERS_INSET_LFRB values."
+  #elif ENABLED(LEVEL_CORNERS_USE_PROBE)
+    #if !HAS_BED_PROBE
+      #error "LEVEL_CORNERS_USE_PROBE requires a real probe."
+    #elif ENABLED(SENSORLESS_PROBING)
+      #error "LEVEL_CORNERS_USE_PROBE is incompatible with SENSORLESS_PROBING."
+    #endif
+  #endif
+#endif
+
 /**
  * Allow only one bed leveling option to be defined
  */

Marlin/src/lcd/tft/ui_320x240.cpp

   tft.set_background(COLOR_BACKGROUND);
 }
 
+int lcd_put_wchar_max(wchar_t c, pixel_len_t max_length) {
+  tft_string.set();
+  tft_string.add(c);
+  tft.add_text(MENU_TEXT_X_OFFSET, MENU_TEXT_Y_OFFSET, COLOR_MENU_TEXT, tft_string);
+  return tft_string.width();
+}
+
 int lcd_put_u8str_max_P(PGM_P utf8_str_P, pixel_len_t max_length) {
   tft_string.set(utf8_str_P);
   tft_string.trim();