Patch delta endstop adjustment config

Marlin/Conditionals_post.h

   // Stepper pulse duration, in cycles
   #define STEP_PULSE_CYCLES ((MINIMUM_STEPPER_PULSE) * CYCLES_PER_MICROSECOND)
 
-  #ifndef DELTA_ENDSTOP_ADJ_X
-    #define DELTA_ENDSTOP_ADJ_X 0
-  #endif
-  #ifndef DELTA_ENDSTOP_ADJ_Y
-    #define DELTA_ENDSTOP_ADJ_Y 0
-  #endif
-  #ifndef DELTA_ENDSTOP_ADJ_Z
-    #define DELTA_ENDSTOP_ADJ_Z 0
+  #ifndef DELTA_ENDSTOP_ADJ
+    #define DELTA_ENDSTOP_ADJ { 0 }
   #endif
 
 #endif // CONDITIONALS_POST_H

Marlin/configuration_store.cpp

   #endif
 
   #if ENABLED(DELTA)
-    endstop_adj[X_AXIS] = DELTA_ENDSTOP_ADJ_X;
-    endstop_adj[Y_AXIS] = DELTA_ENDSTOP_ADJ_Y;
-    endstop_adj[Z_AXIS] = DELTA_ENDSTOP_ADJ_Z;
+    const float adj[ABC] = DELTA_ENDSTOP_ADJ;
+    endstop_adj[A_AXIS] = adj[A_AXIS];
+    endstop_adj[B_AXIS] = adj[B_AXIS];
+    endstop_adj[C_AXIS] = adj[C_AXIS];
     delta_radius =  DELTA_RADIUS;
     delta_diagonal_rod =  DELTA_DIAGONAL_ROD;
     delta_segments_per_second =  DELTA_SEGMENTS_PER_SECOND;

Marlin/example_configurations/delta/biv2.5/Configuration.h

   // in ultralcd.cpp@lcd_delta_calibrate_menu()
   //#define DELTA_CALIBRATION_MENU
 
+  //#define DELTA_ENDSTOP_ADJ { 0, 0, 0 }
+
 #endif
 
 // Enable this option for Toshiba steppers

Marlin/example_configurations/delta/generic/Configuration.h

   // in ultralcd.cpp@lcd_delta_calibrate_menu()
   //#define DELTA_CALIBRATION_MENU
 
+  //#define DELTA_ENDSTOP_ADJ { 0, 0, 0 }
+
 #endif
 
 // Enable this option for Toshiba steppers

Marlin/example_configurations/delta/kossel_mini/Configuration.h

   // in ultralcd.cpp@lcd_delta_calibrate_menu()
   //#define DELTA_CALIBRATION_MENU
 
+  //#define DELTA_ENDSTOP_ADJ { 0, 0, 0 }
+
 #endif
 
 // Enable this option for Toshiba steppers

Marlin/example_configurations/delta/kossel_pro/Configuration.h

   // in ultralcd.cpp@lcd_delta_calibrate_menu()
   //#define DELTA_CALIBRATION_MENU
 
+  //#define DELTA_ENDSTOP_ADJ { 0, 0, 0 }
+
 #endif
 
 // Enable this option for Toshiba steppers

Marlin/example_configurations/delta/kossel_xl/Configuration.h

   // in ultralcd.cpp@lcd_delta_calibrate_menu()
   //#define DELTA_CALIBRATION_MENU
 
+  //#define DELTA_ENDSTOP_ADJ { 0, 0, 0 }
+
 #endif
 
 // Enable this option for Toshiba steppers