Fixes current holdings value computation in CalculateOrderQuantity
Fixes current holdings value computation in CalculateOrderQuantity

The variable currentHoldingsValue didn't take into account the quote currency conversion rate.

Jay-Jay-D/LeanSTP,redmeros/Lean,jameschch/Lean,StefanoRaggi/Lean,kaffeebrauer/Lean,redmeros/Lean,kaffeebrauer/Lean,tomhunter-gh/Lean,QuantConnect/Lean,JKarathiya/Lean,young-zhang/Lean,andrewhart098/Lean,andrewhart098/Lean,AnshulYADAV007/Lean,StefanoRaggi/Lean,Mendelone/forex_trading,Jay-Jay-D/LeanSTP,jameschch/Lean,kaffeebrauer/Lean,young-zhang/Lean,tomhunter-gh/Lean,jameschch/Lean,Mendelone/forex_trading,tomhunter-gh/Lean,andrewhart098/Lean,StefanoRaggi/Lean,kaffeebrauer/Lean,Mendelone/forex_trading,kaffeebrauer/Lean,redmeros/Lean,AnshulYADAV007/Lean,AlexCatarino/Lean,andrewhart098/Lean,StefanoRaggi/Lean,AlexCatarino/Lean,StefanoRaggi/Lean,QuantConnect/Lean,AlexCatarino/Lean,AnshulYADAV007/Lean,jameschch/Lean,AlexCatarino/Lean,AnshulYADAV007/Lean,young-zhang/Lean,Mendelone/forex_trading,JKarathiya/Lean,JKarathiya/Lean,tomhunter-gh/Lean,QuantConnect/Lean,JKarathiya/Lean,Jay-Jay-D/LeanSTP,redmeros/Lean,young-zhang/Lean,AnshulYADAV007/Lean,Jay-Jay-D/LeanSTP,jameschch/Lean,QuantConnect/Lean,Jay-Jay-D/LeanSTP