Do not persist canvas type fallback due to OpenGL failure

If the user wants to always use fallback,
they can set this option explicitly

common/eda_draw_frame.cpp

@@ -176,6 +176,7 @@ EDA_DRAW_FRAME::EDA_DRAW_FRAME( KIWAY* aKiway, wxWindow* aParent, FRAME_T aFrame
 
 EDA_DRAW_FRAME::~EDA_DRAW_FRAME()
 {
+    if( !m_openGLFailureOccured )
         saveCanvasTypeSetting( m_canvasType );
 
     delete m_actions;