wp fix edwardcross

Zip code coverage popup shows 0s when hitting backspace Steps to recreate: 1. From view cart, click on checkout (assuming all conditions are met) 2. You should see a coverage popup. Start typing any 5-digit number 3. Hit backspace to delete a number; it will turn into a 0. Another backspace will product yet another 0. 4. The only way to clear the input is to highlight whatever was typed and type over it. Resolution: User should be able to backspace and delete numbers like an ordinary input field