Fix crash in track date selection dialog

Co-authored-by: Ivan Iskandar <12537387+ivaniskandar@users.noreply.github.com>

app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackInfoDialog.kt

@@ -427,6 +427,7 @@ private data class TrackDateSelectorScreen(
     private val start: Boolean,
 ) : Screen() {
 
+    @Transient
     private val selectableDates = object : SelectableDates {
         override fun isSelectableDate(utcTimeMillis: Long): Boolean {
             val dateToCheck = Instant.ofEpochMilli(utcTimeMillis)