Improve fetching of current binaries UUID

- This now also works with unit tests
- Fixed BITStoreUpdateManager for now failed unit tests
- Fixed a typo

Thanks to @0xced !
Improve last commit by removing conditional 64bit compile

Again thanks to @0xced :)
Fix manually calling `checkForUpdate` on `BITUpdateManager` with `updateSetting=BITUpdateCheckManually` not working