Revert cdex version back to 001.

We bumped the version due to disabling deduping but:
1) the reason for disabing deduping are minor (access checks in Java)
2) public users (and dogfooders now) will have already regenerate a cdex
   file with code item deduping removed, thanks to the vdex format having
   changed in S.

Bug: 192327398
Test: test.py
Change-Id: I5ccb2dbc37daa682909db671f400f151152f70ac
1 file changed