Core/Scripts: Reverted part of 7afb179185, fixes selecting random target starting at given position

Closes #3127

src/server/game/AI/CoreAI/UnitAI.h

@@ -160,7 +160,11 @@ class UnitAI
                     return *ritr;
                 }
                 case SELECT_TARGET_RANDOM:
-                    return SelectRandomContainerElement(targetList);
+                {
+                    std::list<Unit*>::iterator itr = targetList.begin();
+                    std::advance(itr, urand(position, targetList.size() - 1));
+                    return *itr;
+                }
                 default:
                     break;
             }