[KeywordPolicy] Use atom-keyed maps instead of string-keyed maps

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

@@ -61,9 +61,9 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
   end
 
   def save_keyword_policy(%{
-        "federated_timeline_removal" => ftr,
-        "reject" => reject,
-        "replace" => replace
+        federated_timeline_removal: ftr,
+        reject: reject,
+        replace: replace
       }) do
     with true <- Enum.all?(ftr, &String.valid?(&1)),
          true <- Enum.all?(reject, &String.valid?(&1)),

lib/pleroma/web/admin_api/admin_api_controller.ex

@@ -197,7 +197,7 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
   def add_keyword_policy(conn, %{"policy" => policy}) do
     result =
       policy
-      |> Poison.decode!()
+      |> Poison.decode!(keys: :atoms!)
       |> KeywordPolicy.save_keyword_policy()
 
     case result do
@@ -216,9 +216,9 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
   @doc "Reset the keyword policy"
   def reset_keyword_policy(conn, _params) do
     KeywordPolicy.save_keyword_policy(%{
-      "federated_timeline_removal" => [],
-      "reject" => [],
-      "replace" => %{}
+      federated_timeline_removal: [],
+      reject: [],
+      replace: %{}
     })
 
     conn