Have permissions decorators check user signed in

Rather than force us to write the decorators in a specific order let’s
just have one decorator call the other. This should make fewer lines of
code, and fewer annoying test failures. It also means that the same way
of raising a `401` (through the `current_app` method) is used
everywhere.

app/main/views/choose_account.py

@@ -1,8 +1,8 @@
 from flask import redirect, render_template, session, url_for
-from flask_login import current_user, login_required
+from flask_login import current_user
 
 from app.main import main
-from app.utils import PermanentRedirect
+from app.utils import PermanentRedirect, user_is_logged_in
 
 
 @main.route("/services")
@@ -16,7 +16,7 @@ def services_or_dashboard():
 
 
 @main.route("/accounts")
-@login_required
+@user_is_logged_in
 def choose_account():
     return render_template(
         'views/choose-account.html',