Revert "test kbd evt optional"

This reverts commit 364bf0ce.

hw3d/App.cpp

@@ -21,23 +21,6 @@ int App::Go()
 
 void App::DoFrame()
 {
-	static std::string title;
-	while( const auto e = wnd.kbd.ReadKey() )
-	{
-		if( e->IsPress() && e->GetCode() == VK_BACK )
-		{
-			title.clear();
-			wnd.SetTitle( title );
-		}
-	}
-	while( const auto c = wnd.kbd.ReadChar() )
-	{
-		if( *c != 0x8 ) // don't print backspace
-		{
-			title += *c;
-			wnd.SetTitle( title );
-		}
-	}
 	const float c = sin( timer.Peek() ) / 2.0f + 0.5f;
 	wnd.Gfx().ClearBuffer( c,c,1.0f );
 	wnd.Gfx().DrawTestTriangle();