Feat-fix flask app user variables

1. Set username to REMOTE_USER
2. Set fullname to Displayname

app/__init__.py

@@ -47,13 +47,8 @@ def create_app(config_name):
     def get_authorized_user():
 
         user = {
-            "username": re.search(
-                r"([^!]+?)(@uab\.edu)?$", request.headers.get("Persistent-Id")
-            ).group(1),
-            "fullname": (
-                f"{request.headers.get('Givenname')}"
-                f" {request.headers.get('Sn')}"
-            ),
+            "username": request.headers.get("REMOTE_USER"),
+            "fullname": request.headers.get("Displayname"),
             "email": request.headers.get("Mail"),
             "eppa": request.headers.get("Unscoped-Affiliation"),
         }