Pass PCB display settings to PNS router tool

This allows the tool to set display options like the clearance.

Fixes: lp:1766836
* https://bugs.launchpad.net/kicad/+bug/1766836

pcbnew/router/pns_tool_base.cpp

@@ -101,6 +101,7 @@ void TOOL_BASE::Reset( RESET_REASON aReason )
     m_iface->SetBoard( board() );
     m_iface->SetView( getView() );
     m_iface->SetHostTool( this );
+    m_iface->SetDisplayOptions( (PCB_DISPLAY_OPTIONS*) frame()->GetDisplayOptions() );
 
     m_router = new ROUTER;
     m_router->SetInterface( m_iface );