Remove deletion of regression.log
Remove deletion of regression.log

This file is no longer written as part of the regresson test suit.
Regression logs files can now be found in the ./passed and ./regression
folders from the test's executing directory.

kaffeebrauer/Lean,AnshulYADAV007/Lean,JKarathiya/Lean,AnshulYADAV007/Lean,JKarathiya/Lean,StefanoRaggi/Lean,AlexCatarino/Lean,StefanoRaggi/Lean,kaffeebrauer/Lean,QuantConnect/Lean,redmeros/Lean,AlexCatarino/Lean,redmeros/Lean,Jay-Jay-D/LeanSTP,StefanoRaggi/Lean,Jay-Jay-D/LeanSTP,redmeros/Lean,jameschch/Lean,Jay-Jay-D/LeanSTP,AlexCatarino/Lean,jameschch/Lean,AlexCatarino/Lean,StefanoRaggi/Lean,jameschch/Lean,Jay-Jay-D/LeanSTP,JKarathiya/Lean,AnshulYADAV007/Lean,jameschch/Lean,kaffeebrauer/Lean,jameschch/Lean,Jay-Jay-D/LeanSTP,StefanoRaggi/Lean,AnshulYADAV007/Lean,AnshulYADAV007/Lean,kaffeebrauer/Lean,QuantConnect/Lean,QuantConnect/Lean,redmeros/Lean,JKarathiya/Lean,QuantConnect/Lean,kaffeebrauer/Lean