French media giant Vivendi is looking to change the terms of its deal with Mediaset over the Italian company’s pay TV unit. Vivendi confirmed that it is no longer looking to take control of 100% of Mediaset’s loss-making pay TV unit, earning the chagrin of Mediaset execs, who have fired back and accused Vivendi of breaking a signed agreement. Back in April, when news of the deal closing was announced, the Vivendi-Mediaset alliance was being heralded as a game-changer for…