Fix various errors, warnings in example config builds (#19686)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/lcd/menu/menu_delta_calibrate.cpp

@@ -118,7 +118,7 @@ void lcd_delta_settings() {
 }
 
 void menu_delta_calibrate() {
-  const bool all_homed = all_axes_homed();
+  TERN_(DELTA_CALIBRATION_MENU, const bool all_homed = all_axes_homed()); // Acquire ahead of loop
 
   START_MENU();
   BACK_ITEM(MSG_MAIN);