Allow focus-linking with invisible recipe slots

Library/src/main/java/mezz/jei/library/gui/recipes/layout/builder/RecipeLayoutBuilder.java

@@ -98,8 +98,7 @@ private void addOutputSlotTooltipCallback(RecipeSlotBuilder slot) {
 
 	@Override
 	public IIngredientAcceptor<?> addInvisibleIngredients(RecipeIngredientRole role) {
-		// invisible slots are only used by IngredientSupplierBuilder, and are ignored here
-		return IngredientAcceptorVoid.INSTANCE;
+		return new RecipeSlotBuilder(ingredientManager, nextSlotIndex++, role);
 	}
 
 	@Override