Apply TERN to compact code (#17619)

Marlin/src/module/tool_change.h

@@ -31,9 +31,7 @@
       float swap_length, extra_prime;
       int16_t prime_speed, retract_speed;
     #endif
-    #if ENABLED(TOOLCHANGE_PARK)
-      xy_pos_t change_point;
-    #endif
+    TERN_(TOOLCHANGE_PARK, xy_pos_t change_point);
     float z_raise;
   } toolchange_settings_t;
 
@@ -93,13 +91,9 @@
   #endif
 #endif
 
-#if ENABLED(ELECTROMAGNETIC_SWITCHING_TOOLHEAD)
-  void est_init();
-#endif
+TERN_(ELECTROMAGNETIC_SWITCHING_TOOLHEAD, void est_init());
 
-#if ENABLED(SWITCHING_TOOLHEAD)
-  void swt_init();
-#endif
+TERN_(SWITCHING_TOOLHEAD, void swt_init());
 
 /**
  * Perform a tool-change, which may result in moving the