EventWait should not signal the event when it returns Success (#2739)

* Fix race when EventWait is called and a wait is done on the CPU

* This is useless now

* Fix EventSignal

* Ensure the signal belongs to the current fence, to avoid stale signals

Ryujinx.HLE/HOS/Services/SurfaceFlinger/SurfaceFlinger.cs

@@ -392,7 +392,7 @@ namespace Ryujinx.HLE.HOS.Services.SurfaceFlinger
             }
             else
             {
-                item.Fence.RegisterCallback(_device.Gpu, () =>
+                item.Fence.RegisterCallback(_device.Gpu, (x) =>
                 {
                     _device.Gpu.Window.SignalFrameReady();
                     _device.Gpu.GPFifo.Interrupt();