When Ivan Uranga decided to shut the door on a 14-year office job to own his own business, the chicken sandwiches game in Gilroy was wide open. Today, two and a half years after opening Macaco Spicy Chicken Sandwiches, competition is fierce since Chick-fil-A and others moved into the niche. Fortunately for small businesses like Uranga’s, his was among more than 150 Bay Area eateries receiving a $5,000 grant meant to help small businesses invest …