Don't rebuild on page change in MSW

This bug appears to not happen on MSW, so we can avoid the refresh

Fixes https://gitlab.com/kicad/code/kicad/-/issues/5210

pcbnew/widgets/appearance_controls.cpp

@@ -229,6 +229,7 @@ void APPEARANCE_CONTROLS::OnNotebookPageChanged( wxNotebookEvent& aEvent )
         m_notebook->ChangeSelection( static_cast<unsigned>( page ) );
 #endif
 
+#ifndef __WXMSW__
     // Because wxWidgets is broken and will send click events to children of the collapsible
     // panes even if they are collapsed without this
     Freeze();
@@ -236,6 +237,7 @@ void APPEARANCE_CONTROLS::OnNotebookPageChanged( wxNotebookEvent& aEvent )
     m_panelNetsAndClasses->Fit();
     m_sizerOuter->Layout();
     Thaw();
+#endif
 }