Fix logic error

main.py

 import threading
 import time
 import queue
+import base64
 
 import pygame
 from flask import request, Flask, Response, Request
@@ -93,7 +94,7 @@ def wr_set_widget():
             "error": "No widget provided"
         }, 400)
 
-    if widget_name not in PROP_AVAILABLE_PATTERNS:
+    if widget_name not in PROP_AVAILABLE_WIDGETS:
         return json_response({
             "error": f"Widget {widget_name} is not available"
         }, 400)