Fix: Update customer_service.json (#8238)

### What problem does this PR solve?

The issue of reporting the 「Can't inference the where the component
input is. Please identify whose output is this component's input」error
when creating an Agent using the Customer service template has been
resolved.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

agent/templates/customer_service.json

@@ -199,7 +199,12 @@
             "rerank_id": "",
             "similarity_threshold": 0.2,
             "top_k": 1024,
-            "top_n": 6
+            "top_n": 6,
+            "query": [{
+              "type": "reference",
+              "component_id": "answer:0"
+             }],
+            "use_kg": false
           }
         },
         "upstream": [
@@ -645,7 +650,7 @@
             "x": 674.4543037737495,
             "y": 855.3858500356805
           },
-          "selected": false,
+          "selected": true,
           "sourcePosition": "right",
           "targetPosition": "left",
           "type": "retrievalNode",
@@ -932,7 +937,7 @@
             "y": 962.5655101584402
           },
           "resizing": false,
-          "selected": true,
+          "selected": false,
           "sourcePosition": "right",
           "style": {
             "height": 163,