Fixed `scopes` of apps / authorizations / tokens from apps initially created...

Fixed `scopes` of apps / authorizations / tokens from apps initially created with space-delimited `scope`.

priv/repo/migrations/20190222104808_data_migration_normalize_scopes.exs

+defmodule Pleroma.Repo.Migrations.DataMigrationNormalizeScopes do
+  use Ecto.Migration
+
+  def up do
+    for t <- [:apps, :oauth_authorizations, :oauth_tokens] do
+      execute "UPDATE #{t} SET scopes = string_to_array(array_to_string(scopes, ' '), ' ');"
+    end
+  end
+
+  def down, do: :noop
+end