When Dalton Rushing hit a grand slam against the Mets on Wednesday night, Edwin Diaz had conflicting feelings. On one hand, he was overjoyed for Rushing, the second-year catcher who has made the most of his limited playing time as Will Smith’s backup. On the other hand … “I wanted to go in the game,” a chuckling Diaz said in Spanish. Rushing’s home run had turned a save situation into a blowout. With a series in hitter-friendly Colorado set to start on Friday, manager Dave Roberts elected not