Update the EIT event in db when a bigger description is available on DVB side

[daniel.chassot@…]

Currently the DVB EIT events are only sent once to the database, when they are initially received. If a newer enhanced description is received later on, it is discarded.

My provider sends no description at all for programs on other bouquets except the event name, so the db is filled first with event names only and is never updated later on.

The same provider provides a more detailed description for the current event than for the next one so to get the maximum data out of the EIT, description has to be updated when a bigger on is found.

This is what the attached patch does.

Note: I've made my best to keep the rest of the logic untouched but I'm not sure I understood all the previously handled cases.

[danielk]

(In [9144]) Closes #916, by applying patch.