Fix Titanfall Online pkg file parsing/decrypting

[p0358]

Everything seems to be okay now, but I didn't have an opportunity to test it with UnCSO2 GUI to ensure. Yes, basically all uint32 in the entry header needed to be changed to uint64 plus padding adjusted and it just works then xD Credits for header reversal to @mrsteyk

I also did a tiny change/test around decrypting small files

[p0358]

C:\projects\libuncso2\tests\tfo\nexon\test_pkgfile.cpp(43): FAILED:
  REQUIRE( GetDataHash(fileData, fileDataLen) == tfo::PackageFileHashes[iCurIndex] )
with expansion:
  "cab6520af0e54b17b46a9ae45611c339e64e50e06f341dd834464acc9689af15"
  ==
  "42d3b7b74b8feb7f6801930ba58aef6bb85fa2d8a465cffef36c906566cbeeb4"

It seems that the checksums hardcoded into the tests were incorrect, the top checksum that the new build computed is equal to what I compute from my dumped files that were extracted with the original game engine itself. I'm updating the tests to correct that