Fixes signing script for installer.
Fixes signing script for installer.

DEVSENSE/PTVS,Microsoft/PTVS,zooba/PTVS,zooba/PTVS,DEVSENSE/PTVS,DEVSENSE/PTVS,Microsoft/PTVS,DinoV/PTVS,Microsoft/PTVS,DinoV/PTVS,DinoV/PTVS,DinoV/PTVS,zooba/PTVS,huguesv/PTVS,Microsoft/PTVS,huguesv/PTVS,int19h/PTVS,Microsoft/PTVS,zooba/PTVS,huguesv/PTVS,DEVSENSE/PTVS,int19h/PTVS,DEVSENSE/PTVS,huguesv/PTVS,DinoV/PTVS,int19h/PTVS,int19h/PTVS,zooba/PTVS,int19h/PTVS,DEVSENSE/PTVS,Microsoft/PTVS,zooba/PTVS,huguesv/PTVS,huguesv/PTVS,int19h/PTVS,DinoV/PTVS