Fix invalid IPv6 notation

virtweb_frontend/src/widgets/forms/IPInput.tsx

@@ -128,6 +128,6 @@ function sanitizeMask(version: 4 | 6, mask?: string): number | undefined {
   if (version === 4) {
     return value < 0 || value > 32 ? 32 : value;
   } else {
-    return value < 0 || value > 64 ? 64 : value;
+    return value < 0 || value > 128 ? 128 : value;
   }
 }