Fix cursor bugs in simulation.

1) cancel simProbe or simTune when simulator window closed
2) handle non-stock cursors through SetCurrentCursor()

Fixes: lp:1833583
* https://bugs.launchpad.net/kicad/+bug/1833583

eeschema/sim/sim_plot_frame.cpp

@@ -1262,6 +1262,9 @@ void SIM_PLOT_FRAME::onClose( wxCloseEvent& aEvent )
     if( IsSimulationRunning() )
         m_simulator->Stop();
 
+    // Cancel a running simProbe or simTune tool
+    m_schematicFrame->GetToolManager()->RunAction( ACTIONS::cancelInteractive );
+
     Destroy();
 }