Specify default scope in verify_credentials

Certain Mastodon/Pleroma front ends call verify_credentials to get the
default scope of a new toot.

Currently, Pleroma hardcodes this value to "public".

This patch changes it to the user's default_scope value.

lib/pleroma/user.ex

@@ -68,7 +68,8 @@ defmodule Pleroma.User do
       following_count: length(user.following) - oneself,
       note_count: user.info["note_count"] || 0,
       follower_count: user.info["follower_count"] || 0,
-      locked: user.info["locked"] || false
+      locked: user.info["locked"] || false,
+      default_scope: user.info["default_scope"] || "public"
     }
   end
 

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

@@ -46,7 +46,7 @@ defmodule Pleroma.Web.MastodonAPI.AccountView do
       fields: [],
       source: %{
         note: "",
-        privacy: "public",
+        privacy: user_info.default_scope,
         sensitive: "false"
       }
     }