Make subscriptions the same direction as blocks

That being, user - subscribes to -> users, rather than
user - has subscribers -> users

lib/pleroma/user.ex

@@ -1006,7 +1006,12 @@ defmodule Pleroma.User do
     do: Repo.all(from(u in User, where: u.ap_id in ^user.info.blocks))
 
   def subscribed_users(user),
-    do: Repo.all(from(u in User, where: u.ap_id in ^user.info.subscriptions))
+    do:
+      Repo.all(
+        from(u in User,
+          where: fragment("?->'subscriptions' @> ?", u.info, ^user.ap_id)
+        )
+      )
 
   def block_domain(user, domain) do
     info_cng =

lib/pleroma/web/common_api/utils.ex

@@ -338,7 +338,8 @@ defmodule Pleroma.Web.CommonAPI.Utils do
   def maybe_notify_subscribers(
         recipients,
         %Activity{data: %{"actor" => actor, "type" => type}}
-  ) when type == "Create" do
+      )
+      when type == "Create" do
     with %User{} = user <- User.get_by_ap_id(actor) do
       subscriber_ids =
         user