Fix instrument end of run scripts

For use in ibex end of run scripts should have
```
setlocal
set "PATH=c:\windows\system32;c:\windows;c:\windows\system32\wbem"
```
added to the top. Also `DOCROOT` set should be
```
@set "DOCROOT=C:\Users\spudulike\Documents"
```
They can work without this, but may sometimes stop working. The issue is that the path can get appaened to during the spawn and may become too big and get corrupted. This is already done on existing ibex instruments, but should do on seci ones in preparation