Fix test get_user_apps/1

For some reason I had a test who suddenly failed, mix test test/pleroma/web/o_auth/app_test.exs:54. A user has a list of applications and this test adds them and then sees if the list it gets back is the same as the apps it added.

When I ran mix test a day before I didn't have this problem and when I pushed code today in a different MR, the pipeline succeeded (see https://git.pleroma.social/ilja/pleroma/-/jobs/205827), yet locally it failed. So it seems the test can sometimes succeed and sometimes fail, which makes it untrustworthy.

The failure I see is because the returned list is in reverse order. I assume that's not per sé wrong. You just want to know if the apps you added are actually there. I fixed the test by first ordering the lists before comparing.

AFAICT (and as far as that's relevant) the test got introduced in commit cb2a072e62

test/pleroma/web/o_auth/app_test.exs

@@ -51,6 +51,6 @@ defmodule Pleroma.Web.OAuth.AppTest do
       insert(:oauth_app, user_id: user.id)
     ]
 
-    assert App.get_user_apps(user) == apps
+    assert Enum.sort(App.get_user_apps(user)) == Enum.sort(apps)
   end
 end