Fix missing x_request_id data

**Phenomenon and reproduction steps**

**Root cause and solution**

**Impactions**

**Test method**

**Affected branch(es)**

* main

**Checklist**

- [ ] Dependencies update required
- [ ] Common bug (similar problem in other repo)

app/app/application/tracing_completion.py

@@ -269,7 +269,7 @@ async def trace_l7_flow(self,
                      dataframe_flowmetas['x_request_id_1'][index]))
             new_x_request_metas -= x_request_metas
             x_request_metas |= new_x_request_metas
-            x_requests = [L7XrequestMeta(nxr) for nxr in new_x_request_metas]
+            xrequests = [L7XrequestMeta(nxr) for nxr in new_x_request_metas]
             # x_request_id related query
             x_request_filters = []
             if x_request_id_0s: