Tongue In Cheek, Springfield Merchants Vie To Sell Most T-Shirts By LIBBY CUDMORE SPRINGFIELD ‘It’s not a contest,” Ernie Adams, of Country Memories in Springfield, insisted. “But I am winning.” As the 100th anniversary of Springfield’s annual Fourth of July parade approaches, he and Tom Mabie, of Tom and Kelly’s, are in a tongue-in-cheek contest to see who can sell the most of the $10 celebration T-shirts. “Everything is a competition for me,” said Mabie. “And if it isn’t, I…