Minor cosmetic fix to generic check tools appearance in wxOSX.

Use rounded rectangle to indicate the selected tool instead of a plain one.

Closes #12409.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66043 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/cocoa/toolbar.mm

@@ -516,7 +516,7 @@ void wxToolBarTool::UpdateImages()
         dc.SelectObject( m_alternateBitmap );
         dc.SetPen( wxPen(*wxBLACK) );
         dc.SetBrush( wxBrush( *wxLIGHT_GREY ));
-        dc.DrawRectangle( 0, 0, w, h );
+        dc.DrawRoundedRectangle( 0, 0, w, h, 2 );
         dc.DrawBitmap( m_bmpNormal, 0, 0, true );
         dc.SelectObject( wxNullBitmap );