Fixes wrong path variable in Bitsadmin artifact

[f-block]

FullPath is not defined/part of any surrounding select statement and hence not known to the query. This artifact fails with:

ERROR: Symbol FullPath not found. Current Scope is: ...

[CLAassistant]

All committers have signed the CLA.

[scudette]

FullPath is actually provided from the files query. In recent velociraptor versions we have deprecated FullPath in favour of OSPath so probably we need to change that instead

[f-block]

Interesting, using OSPath does indeed fix it, even though other artifacts still work with FullPath and just note the deprecation. Probably depends on which plugin/function is used.