refactor: use transaction to go brr.
This improve the restore speed on fresh db and non fresh db.
Signed-off-by: KaiserBh <kaiserbh@proton.me>
(cherry picked from commit b1067b942ef5c8d53e5ab838ef078789b9c0627a)
# Conflicts:
# app/src/main/java/eu/kanade/tachiyomi/data/backup/restore/restorers/MangaRestorer.kt