chore: remove dead commented-out code from topology.ex (#137)

Removes the commented-out `apply_inferred_role` function that was left behind when device type was simplified to manual-only.

Split from #135.

Reviewed-on: graham/towerops-web#137

lib/towerops/topology.ex

@@ -936,15 +936,6 @@ defmodule Towerops.Topology do
     end
   end
 
-  # Deprecated: Auto-inference is disabled
-  # defp apply_inferred_role(device, role) when role == device.device_role, do: {:ok, device}
-  #
-  # defp apply_inferred_role(device, role) do
-  #   device
-  #   |> Ecto.Changeset.change(%{device_role: role})
-  #   |> Repo.update()
-  # end
-
   defp vendor_match?(value, vendors), do: Enum.any?(vendors, &String.contains?(value, &1))
 
   defp platform_match?(description, platforms), do: Enum.any?(platforms, &String.contains?(description, &1))