Fix XMAInitializeContext is_stereo flag.
Fix XMAInitializeContext is_stereo flag.

ObsidianGuardian/xenia,sephiroth99/xenia,maxton/xenia,no1dead/xenia,maxton/xenia,maxton/xenia,TRex22/xenia,sephiroth99/xenia,sephiroth99/xenia,TRex22/xenia,ObsidianGuardian/xenia,ObsidianGuardian/xenia,sabretooth/xenia,sabretooth/xenia,no1dead/xenia,no1dead/xenia,sabretooth/xenia,TRex22/xenia,no1dead/xenia