Fix OnOpenGlInit getting called twice

src/Avalonia.OpenGL/Controls/OpenGlControlBase.cs

@@ -108,8 +108,6 @@ namespace Avalonia.OpenGL.Controls
             _visual.Size = new Vector(Bounds.Width, Bounds.Height);
             _visual.Surface = _resources.Surface;
             ElementComposition.SetElementChildVisual(this, _visual);
-            using (_resources.Context.MakeCurrent())
-                OnOpenGlInit(_resources.Context.GlInterface);
             return true;
 
         }