Check if username is the same as in the current session

backend/src/app.py

@@ -122,9 +122,9 @@ def refresh():
 @app.route('/api/username', methods=['GET'])
 @flask_praetorian.auth_required
 def get_username():
-    user = flask_praetorian.current_user().username
-    ret = {'username': user}
-    return user, 200
+    username = flask_praetorian.current_user().username
+    ret = {'username': username}
+    return ret, 200
 
 
 @app.route('/api/protected')