Fix wrong types in KitsuAlgoliaSearchItem

This API returns start and end dates as Long and the score as Double.

Kitsu's docs claim they're strings (and they are, when requesting
manga details from Kitsu directly) but the Algolia search results
return Longs and Double, respectively.

app/src/main/java/eu/kanade/tachiyomi/data/track/kitsu/dto/KitsuSearch.kt

@@ -31,9 +31,9 @@ data class KitsuAlgoliaSearchItem(
     val subtype: String?,
     val posterImage: KitsuSearchItemCover?,
     val synopsis: String?,
-    val averageRating: String?,
-    val startDate: String?,
-    val endDate: String?,
+    val averageRating: Double?,
+    val startDate: Long?,
+    val endDate: Long?,
 ) {
     @Suppress("MagicNumber")
     fun toTrack(): TrackSearch {
@@ -44,12 +44,12 @@ data class KitsuAlgoliaSearchItem(
             cover_url = posterImage?.original ?: ""
             summary = synopsis ?: ""
             tracking_url = KitsuApi.mangaUrl(remote_id)
-            score = averageRating?.toDoubleOrNull() ?: -1.0
+            score = averageRating ?: -1.0
             publishing_status = if (endDate == null) "Publishing" else "Finished"
             publishing_type = subtype ?: ""
             start_date = startDate?.let {
                 val outputDf = SimpleDateFormat("yyyy-MM-dd", Locale.US)
-                outputDf.format(Date(it.toLong() * 1000))
+                outputDf.format(Date(it * 1000))
             } ?: ""
         }
     }