Limit number of events that can be retrieved from GetDisplayVSyncEvent (#3188)

* Limit number of events that can be retrieved from GetDisplayVSyncEvent

* Cleaning

* Rename openDisplayInfos -> openDisplays

Ryujinx.HLE/HOS/Services/Vi/ISystemRootService.cs

@@ -17,7 +17,7 @@ namespace Ryujinx.HLE.HOS.Services.Vi
 
             if (serviceType != ViServiceType.System)
             {
-                return ResultCode.InvalidRange;
+                return ResultCode.PermissionDenied;
             }
 
             MakeObject(context, new IApplicationDisplayService(serviceType));