creates redundancy for exe.py

[Ekultek]

Thanks for contributing! But first: did you read our community guidelines?
https://cuckoo.sh/docs/introduction/community.html

What I have added/changed is:

A simple check to see if the exe exists or not, if it does it removes it. We use cuckoo in a big project and have had issues with is trying to create a file that already exists.

All this does is creates a type of redundancy so that if the file exists, it removes it and keeps on going.

The goal of my change is:

To make some sort of redundancy in case an issue occurs like the aforementioned

What I have tested about my change is:

My own cuckoo sandbox (wrapping it in a try except block would probably work pretty well too just in case)