[rust] Fix rocket bench config [ci skip] (#8041)

frameworks/Rust/rocket/benchmark_config.json

@@ -1,7 +1,6 @@
 {
   "framework": "rocket",
-  "tests": [
-    {
+  "tests": [{
       "default": {
         "json_url": "/json",
         "plaintext_url": "/plaintext",
@@ -24,9 +23,7 @@
         "display_name": "Rocket",
         "notes": "",
         "versus": "None"
-      }
-    },
-    {
+      },
       "diesel": {
         "json_url": "/json",
         "plaintext_url": "/plaintext",
@@ -50,6 +47,5 @@
         "notes": "",
         "versus": "None"
       }
-    }
-  ]
+    }]
 }