Fix alternatives with updater update to 65.0
Turris updater version 65.0 now supports Alternatives builtin but that creates chicken and an egg situation when we update to this version. This version removes script from postupdate hooks but updater that runs in that time does not support alternatives yet so they are not applied for that transaction.
We should create some sort of fix package that is installed when we update this and runs fix after update. This is easy. Just add that hook back but problem is that this fix package has to stay in system for finished update. It can be removed with subsequent one but update has to finish (no replan) in that moment. Other option can be that we would run fix in prerm script as that would be triggered by updater version 65.0 and not the old one.