Fix DUP_X2 and DUP_X1 not copying values correctly

The DUP_X2 (and therefore DUP_X1) are changing the whole stack structure. For example the stack would change like this: value3, value2, value1 -> value1, value3, value2, value1. As you can see whole stack changed. None of the values are on their right places, so we need to call Interpreter#copyOperation on all values.

Unlike the DUP where the stack changes like: value -> value, value. You can see that only the first value is in the right place and it doesn't need to call Interpreter#copyOperation. Only the second value needs a call to Interpreter#copyOperation.

Also added a test for it.