Remove deprecated dets file

lib/vaccins/application.ex

@@ -18,9 +18,6 @@ defmodule Vaccins.Application do
       {Finch, name: Vaccins.Finch}
     ]
 
-    # This should not be done here but whatever..
-    {:ok, _} = :dets.open_file(Vaccins.LocationStore, type: :set)
-
     # See https://hexdocs.pm/elixir/Supervisor.html
     # for other strategies and supported options
     opts = [strategy: :one_for_one, name: Vaccins.Supervisor]