Eliminate multiple DEFAULT_ACCELERATION declarations.

Re-calculate and fix the Junction Deviation value using correct DEFAULT_ACCELERATION number.

config/examples/Anet/A6/Configuration.h

@@ -786,18 +786,12 @@
  *   M204 R    Retract Acceleration
  *   M204 T    Travel Acceleration
  */
-//#define DEFAULT_ACCELERATION          3000    // X, Y, Z and E acceleration for printing moves
-//#define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration for retracts
-//#define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration for travel (non printing) moves
 
 // ANET A6 Firmware V2.0 defaults:
 // Accel: 1000 A-retract: 1000
 #define DEFAULT_ACCELERATION          1000    // X, Y, Z and E acceleration for printing moves
 #define DEFAULT_RETRACT_ACCELERATION  1000    // E acceleration for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   1000    // X, Y, Z acceleration for travel (non printing) moves
-//#define DEFAULT_ACCELERATION          2000    // X, Y, Z and E acceleration for printing moves
-//#define DEFAULT_RETRACT_ACCELERATION  2000   // E acceleration for retracts
-//#define DEFAULT_TRAVEL_ACCELERATION   4000    // X, Y, Z acceleration for travel (non printing) moves
 
 /**
  * Default Jerk limits (mm/s)
@@ -831,7 +825,7 @@
  *   http://blog.kyneticcnc.com/2018/10/computing-junction-deviation-for-marlin.html
  */
 #if DISABLED(CLASSIC_JERK)
-  #define JUNCTION_DEVIATION_MM 0.013 // (mm) Distance from real junction edge
+  #define JUNCTION_DEVIATION_MM 0.04  // (mm) Distance from real junction edge
 #endif
 
 /**