I did the opposite, even though I think the concept of tips is wrong. The staff has to pay attention to online orders, individually wrap and pack each item, ensure all items are in the bag, call me when it is ready, find my car in the dark (in the rain or soon over piles of snow), all while facing a shortage of help for all their normal duties. That is far more work than stopping by and asking if I want my full glass of water refilled. So, I decided to tip more for pickup than I did when I ate in the restaurant.
Plus I want to-go orders to stay around forever. Solves the loud restaurantitis problem that so many restaurants have (a picnic in the park, when possible, easily trumps the in-restaurant experience). So I want to encourage it.