Fix occasional crash when opening library settings sheet

See https://stackoverflow.com/questions/47648689/sealed-classs-objects-mysteriously-becoming-null-when-referenced-by-other-compa

domain/src/main/java/tachiyomi/domain/library/model/LibraryDisplayMode.kt

@@ -24,7 +24,7 @@ sealed class LibraryDisplayMode(
     }
 
     companion object {
-        val values = setOf(CompactGrid, ComfortableGrid, List, CoverOnlyGrid)
+        val values by lazy { setOf(CompactGrid, ComfortableGrid, List, CoverOnlyGrid) }
         val default = CompactGrid
 
         fun valueOf(flag: Long?): LibraryDisplayMode {

domain/src/main/java/tachiyomi/domain/library/model/LibrarySortMode.kt

@@ -65,8 +65,8 @@ data class LibrarySort(
     }
 
     companion object {
-        val types = setOf(Type.Alphabetical, Type.LastRead, Type.LastUpdate, Type.UnreadCount, Type.TotalChapters, Type.LatestChapter, Type.ChapterFetchDate, Type.DateAdded)
-        val directions = setOf(Direction.Ascending, Direction.Descending)
+        val types by lazy { setOf(Type.Alphabetical, Type.LastRead, Type.LastUpdate, Type.UnreadCount, Type.TotalChapters, Type.LatestChapter, Type.ChapterFetchDate, Type.DateAdded) }
+        val directions by lazy { setOf(Direction.Ascending, Direction.Descending) }
         val default = LibrarySort(Type.Alphabetical, Direction.Ascending)
 
         fun valueOf(flag: Long?): LibrarySort {