pcbnew: Prevent double items recaching on start

Thanks to Seth Hillbrand for pointing out the issue.

Fixes: lp:1779002
* https://bugs.launchpad.net/kicad/+bug/1779002

pcbnew/pcb_draw_panel_gal.cpp

@@ -374,8 +374,6 @@ void PCB_DRAW_PANEL_GAL::OnShow()
         static_cast<KIGFX::PCB_RENDER_SETTINGS*>(
             m_view->GetPainter()->GetSettings() )->LoadDisplayOptions( displ_opts );
     }
-
-    m_view->RecacheAllItems();
 }