Fix library view mode stuck on blank slate

Could happen on builds after bf70d16 if a build predating 86a3708 was quit on blank slate beforehand.

OpenEmu/OEGameCollectionViewController.m

@@ -87,7 +87,7 @@ - (void)viewDidLoad
 
     // Restore grid/list view mode.
     OECollectionViewControllerViewTag tag = [[NSUserDefaults standardUserDefaults] integerForKey:OELastCollectionViewKey];
-    self.selectedViewTag = tag;
+    self.selectedViewTag = tag != -1 ? tag : 0;
 
     [[self listView] setDraggingSourceOperationMask:NSDragOperationCopy forLocal:NO];
 }