Fix switching tabs making the item pool unresponsive

Probably this is hiding the underlying issue but at least it
does fix it from testing.
Anyway they would not be mid-drag when switching
tabs so this should be harmless to do.

app/features/tier-list-maker/routes/tier-list-maker.tsx

@@ -162,6 +162,7 @@ function TierListMakerContent() {
 			</div>
 
 			<DndContext
+				key={itemType}
 				sensors={sensors}
 				collisionDetection={pointerWithin}
 				onDragStart={handleDragStart}