Refactor default settings in load_saved_settings to remove environment variable dependencies

app/web_app.py

@@ -27,9 +27,9 @@ controller = AutomationController()
 
 def load_saved_settings() -> Dict[str, Any]:
     default_settings = {
-        "username": os.getenv("ADULTDVD_USERNAME", ""),
-        "password": os.getenv("ADULTDVD_PASSWORD", ""),
-        "studio": "https://www.adultdvdmarketplace.com/xcart/adult_dvd/disclaimer.php",
+        "username": "",
+        "password": "",
+        "studio": "",
         "min_price": 6.0,
     }