BG4 archives use wrong name & hash when saving

[SomeKitten]

Game Name: Mario & Luigi - Superstar Saga + Bowser's Minions / Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey / (likely Paper Jam and Dream Team too, but I haven't tested those)
Console: 3DS
Format extension(s): .dat
Type: BG4 archive (plugin_alpha_dream)

Bug details:
BG4 archives add a leading slash to the names of files when being saved. This also affects the name hashes making none of the files inside load at all.

Proposed Solution:
Remove the leading forward slash on file names when saving the archive. I will make a PR if I can get Kuriimu2 to build on my PC.

Sample files (if possible):
Working: https://drive.google.com/file/d/1sXAzkPXiitsFk18iMtTNs1vHbRuPkl-P/view?usp=sharing
Broken (after Kuriimu2 save): https://drive.google.com/file/d/1RNIqOuc_NmTJ8-f8xzEO3oN3VFSY31hn/view?usp=sharing