Beta parsoid conf is now in deploy repo

We used to provide Parsoid settings via puppet and creating a symlink
for the service to find it.  Nowadays, the settings are maintained in
the deploy repo directly:

/srv/deployment/parsoid/deploy/conf/wmf/betalabs.localsettings.js

Subbu confirmed the Parsoid upstart loads that file.

Delete obsolete localsettings.js link.

Change-Id: I56cee82d0eff87912a6046faafb06426f5e5b57d