Fix meta struct key for iast events (#3601)

tests/appsec/test_asm_standalone.py

@@ -64,7 +64,7 @@ def _assert_tags_value(span, obj, expected_tags):
     def assert_product_is_enabled(request, product):
         product_enabled = False
         tags = "_dd.iast.json" if product == "iast" else "_dd.appsec.json"
-        meta_struct_key = "vulnerability" if product == "iast" else "appsec"
+        meta_struct_key = "iast" if product == "iast" else "appsec"
         for data, trace, span in interfaces.library.get_spans(request=request):
             # Check if the product is enabled in meta
             meta = span["meta"]