Mario Manningham takes a salary cut

49ers wide receiver Mario Manningham, who is recovering from torn anterior and posterior cruciate ligaments in his left knee, has had his 2013 salary cut from $3.6 million to $1.8 million, according to Jay Hurley of NinersNation.com (via Matt Maiocco of CSNBayArea.com). Maiocco, who confirmed the salary cut, reports that $1.25 million of the $1.8…