fix restoring backup

Author: Secozzi

app/src/main/java/eu/kanade/tachiyomi/data/backup/models/BackupAnime.kt

@@ -43,9 +43,9 @@ data class BackupAnime(
     // Aniyomi specific values
     @ProtoNumber(501) var fetchType: FetchType = FetchType.Episodes,
     @ProtoNumber(502) var parentId: Long? = null,
-    @ProtoNumber(503) var id: Long, // Used to associate seasons with parents. Do not use for anything else.
+    @ProtoNumber(503) var id: Long? = null, // Used to associate seasons with parents. Do not use for anything else.
     @ProtoNumber(504) var seasonFlags: Long = 0,
-    @ProtoNumber(505) var seasonNumber: Double = 0.0,
+    @ProtoNumber(505) var seasonNumber: Double = -1.0,
     @ProtoNumber(506) var seasonSourceOrder: Long = 0,
 ) {
     fun getAnimeImpl(): Anime {