ARLINGTON, Texas – Texas Rangers catcher Jonah Heim caught the first pitch of Friday’s game from his mother-in-law in commemoration of Lou Gehrig Day. Hillary Prince threw out the ceremonial first pitch. Prince was diagnosed with Bulbar Onset ALS three years ago and continues to fight for a cure. Heim was not in the starting lineup Friday, but came in late in the 2-0 win over the Seattle Mariners. He was back behind the plate for the second game of the series Saturday. MLB recognized Gehrig, the New York Yankees Hall of Famer who died of Amyotrophic Lateral Sclerosis in…