Update app.py

app.py

@@ -40,10 +40,13 @@ function start() {
     const urlParams = new URLSearchParams(window.location.search);
     var parampdf = urlParams.get('pdfurl')
     var parammod = urlParams.get('mod')
-    if not (parammod) {
-       parammod="en_US-joe-medium" 
+    var mod
+    if (parammod) {
+       mod=parammod; 
+    } else {
+        mod="en_US-joe-medium";
     }
-    return parampdf,parammod;
+    return parampdf,mod;
 }"""
 
 with gr.Blocks() as app: