Further fix for seed crypto things

[R-YaTian]

This PR is a further work of the previous PR. It creates a reversed copy of header.titleid and passes it to the parse_ncch function, preventing header.titleid from being reversed multiple times. This avoids incorrect data when parse_ncch internally reads header.titleid, ensuring the correct retrieval of the Seed Crypto KeyY when processing multiple NCCH contents.
Additionally, this PR fixes a potential issue with incorrect parsing of titleid[3], preventing possible decryption errors for system applications (0004001x).

Edit: The PR which do similar fix for old python3 version will be opened later on. :p
Edit x2: This PR will fix issue #7.

[shijimasoft]

Thank you @R-YaTian :)

[R-YaTian]

Thank you @R-YaTian :)

You're welcome! I forgot to linking with issue #7, you can close it now :)

[shijimasoft]

No problem :)