Return maps in node_info

It's easiest (and imo most proper) to use tuples {"instance, "reason"} in BE,
but for FE maps like %{"instance": "instance", "reason", "reason"} are better.
I changed it so that node_info returns maps now for simple_policy and quarantined instances.

lib/pleroma/web/activity_pub/mrf/simple_policy.ex

@@ -263,6 +263,9 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
     mrf_simple =
       Config.get(:mrf_simple)
       |> Enum.map(fn {k, v} -> {k, Enum.reject(v, fn {v, _} -> v in exclusions end)} end)
+      |> Enum.map(fn {k, v} ->
+        {k, Enum.map(v, fn {i, r} -> %{"instance" => i, "reason" => r} end)}
+      end)
       |> Enum.into(%{})
 
     {:ok, %{mrf_simple: mrf_simple}}

lib/pleroma/web/mastodon_api/views/instance_view.ex

@@ -95,7 +95,11 @@ defmodule Pleroma.Web.MastodonAPI.InstanceView do
       {:ok, data} = MRF.describe()
 
       data
-      |> Map.merge(%{quarantined_instances: quarantined})
+      |> Map.merge(%{
+        quarantined_instances:
+          quarantined
+          |> Enum.map(fn {instance, reason} -> %{"instance" => instance, "reason" => reason} end)
+      })
     else
       %{}
     end