xorer currently does not change the NCCH flags to reflect whether or not the NCCH is encrypted.

The flag is correctly parsed (src/types/ncch.rs lines 39 [flags_data_format] and 52 [flag_nocrypto]), but then never read, modified or written; neither decrypt_cfa nor decrypt_cxi modify the NCCH flags.

The flag signalling that the NCCH is encrypted should be unset if decrypt_cfa or decrypt_cxi succeed. Not doing so leads to a number of issues when using it:

1. ctrtool -y insists that the hash mismatches if -p is not given.
2. A 3DS will be unable to use the decrypted CXI/CFA/NCSD as it will try to decrypt.
3. NCCH-parsing tools may erroneously believe the file still needs to be decrypted.