Fix fixture: remove request body from /api/query (no requestBody schema in tinynode baseline)

Agent-Logs-Url: https://github.com/CenterForDigitalHumanities/rerum_server_nodejs/sessions/7bb78747-4ce0-4ebe-b49b-5fe69b7b15fa

Co-authored-by: cubap <1119165+cubap@users.noreply.github.com>

Author: Copilot

test/contract-fixtures/tinynode-to-rerum.yaml

@@ -21,11 +21,9 @@ interactions:
             previous: ""
             replaces: ""
 
-  - description: Query objects with a filter
+  - description: Query objects
     path: /api/query
     method: post
-    request:
-      "@type": "http://www.w3.org/ns/oa#Annotation"
     expectedStatus: "200"
     response:
       body: