cmd: fixed wrong else statement processing

[Михаил Быстрянцев]

Fixed bug https://bugs.winehq.org/show_bug.cgi?id=37478

Swapping between if and else processing was occurred every time when else statement occurred, so each odd else/else if was executed.

if 1 == 1 (
  echo 1
) else if 1 == 1 (
  echo 2
) else if 1 == 1(
  echo 3
) else if 1 == 1 (
  echo 4
) else (
  echo 5
)

Output was:
1
3
5
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