[Minor] Logspam on stdout

A few leftover debug printlns in ImageServer - not sure if you want to remove them or replace them with logger calls.

https://gitlab.com/mangadex-pub/mangadex_at_home/-/blob/dfd6777b45e56006ff63c8248be410ee7993c01b/src/main/kotlin/mdnet/base/server/ImageServer.kt#L124 https://gitlab.com/mangadex-pub/mangadex_at_home/-/blob/dfd6777b45e56006ff63c8248be410ee7993c01b/src/main/kotlin/mdnet/base/server/ImageServer.kt#L128 https://gitlab.com/mangadex-pub/mangadex_at_home/-/blob/dfd6777b45e56006ff63c8248be410ee7993c01b/src/main/kotlin/mdnet/base/server/ImageServer.kt#L279 https://gitlab.com/mangadex-pub/mangadex_at_home/-/blob/dfd6777b45e56006ff63c8248be410ee7993c01b/src/main/kotlin/mdnet/base/server/ImageServer.kt#L283