Fix stripping trailing slashes of URLs

Most URLs ending with a trailing slash currently 404, because the strict
mode is not properly disabled in the app.

The strict_slashes value must be set before adding the routes.

After this patch, requesting URLs with a trailing slash will work as
expected (eg git.sr.ht/~sircmpwn/git.sr.ht/)

gitsrht/app.py

@@ -20,6 +20,8 @@ class GitApp(SrhtFlask):
         super().__init__("git.sr.ht", __name__,
                 oauth_service=oauth_service)
 
+        self.url_map.strict_slashes = False
+
         from gitsrht.blueprints.auth import auth
         from gitsrht.blueprints.public import public
         from gitsrht.blueprints.api import register_api
@@ -77,8 +79,6 @@ class GitApp(SrhtFlask):
             os.path.dirname(__file__), "templates"))]
         self.jinja_loader = ChoiceLoader(choices)
 
-        self.url_map.strict_slashes = False
-
     def lookup_user(self, email):
         return User.query.filter(User.email == email).one_or_none()