* download new chapters changes
* move initialFetchChapters logic into onNextChapters
* refractor download new chapter logic to be more explicit
(cherry picked from commit ed029c52aefe8173ffa6da0e73104e51dd6506c8)
# Conflicts:
# app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt
# app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/ChaptersPresenter.kt
1fb6b3775d