Fix AniList user list item fetch erroring (#3220)

The countryOfOrigin field was not included in the findLibManga query
so it is not returned by AniList. Defaulting to an empty string here
should be fine since neither countryOfOrigin nor format are shown in
the findLibManga consumers (i.e. the tracker sheet of a given library
entry).

app/src/main/java/eu/kanade/tachiyomi/data/track/anilist/dto/ALSearchItem.kt

@@ -9,12 +9,12 @@ data class ALSearchItem(
     val coverImage: ItemCover,
     val description: String?,
     val format: String,
-    val countryOfOrigin: String,
     val status: String?,
     val startDate: ALFuzzyDate,
     val chapters: Long?,
     val averageScore: Int?,
     val staff: ALStaff,
+    val countryOfOrigin: String = "",
 ) {
     fun toALManga(): ALManga = ALManga(
         remoteId = id,