am: Fix VR enabled by default (#1715)

This PR fix an issue I've made in #1688 which is enabled VR as default.
It could cause rendering issues in games when VR mode isn't used, as users have reported in Smash:

Ryujinx.HLE/HOS/Services/Am/AppletAE/AllSystemAppletProxiesService/SystemAppletProxy/ICommonStateGetter.cs

@@ -12,7 +12,7 @@ namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.Sys
         private Apm.SystemManagerServer _apmSystemManagerServer;
         private Lbl.LblControllerServer _lblControllerServer;
 
-        private bool _vrModeEnabled = true;
+        private bool _vrModeEnabled = false;
 
         public ICommonStateGetter(ServiceCtx context)
         {