Use PDO in the local cellid script
Use PDO in the local cellid script

With 13ae949 the `mysql` calls have been changed to calls using the `PDO`
classes. This updates `cellid_local.php` to use `PDO` as well. It also uses
the proper capitalisation of the columns because at least the SQLite driver
is case sensitive.

espinosaluis/TrackMeViewer,espinosaluis/TrackMeViewer