Fix Python path issue on Windows VS builds.

Fixed bug introduced by cd77d5ca5fc593aba6386784ed9a5830ca6a37d1. On VS builds,
we the code was incorrectly deciding that the executable was being run from
install dir causing dashboard failures on VS builds. This addresses that issue.

Change-Id: Ibe98db95544964e3a0d9ac155c1c49258ab30c23
Merge topic 'fix_python_paths' into next

b0aff1a Fix Python path issue on Windows VS builds.