Make G11 not horribly broken

Marlin/Marlin_main.cpp

@@ -1072,15 +1072,14 @@ void process_commands()
       }
 
       break;
-      case 11: // G10 retract_recover
+      case 11: // G11 retract_recover
-      if(!retracted)
+      if(retracted)
       {
         destination[X_AXIS]=current_position[X_AXIS];
         destination[Y_AXIS]=current_position[Y_AXIS];
         destination[Z_AXIS]=current_position[Z_AXIS];
-
         current_position[Z_AXIS]+=retract_zlift;
-        current_position[E_AXIS]+=-retract_recover_length;
+        destination[E_AXIS]=current_position[E_AXIS]+retract_length+retract_recover_length; 
         feedrate=retract_recover_feedrate;
         retracted=false;
         prepare_move();