Fix test for derivatives set in the span

dd-java-agent/appsec/src/test/groovy/com/datadog/appsec/gateway/GatewayBridgeSpecification.groovy

@@ -925,31 +925,19 @@ class GatewayBridgeSpecification extends DDSpecification {
     'appsec.another.unrelated.tag'            | false
   }
 
-  void 'derivatives are set in the span after a request'() {
+  void 'fingerprints are set in the span after a request'() {
     given:
-    final mockAppSecCtx = Stub(AppSecRequestContext) {
-      transferCollectedEvents() >> []
-      getRequestHeaders() >> [
-        'host': ['localhost']
-      ]
-    }
+    final mockAppSecCtx = new AppSecRequestContext(derivatives: ['_dd.appsec.fp.http.endpoint': 'xyz'])
     final mockCtx = Stub(RequestContext) {
       getData(RequestContextSlot.APPSEC) >> mockAppSecCtx
       getTraceSegment() >> traceSegment
     }
     final spanInfo = Stub(AgentSpan)
-    traceSegment.getTagTop(tag) >> true
 
     when:
     requestEndedCB.apply(mockCtx, spanInfo)
 
     then:
-    (userTracking ? 1 : 0) * traceSegment.setTagTop('http.request.headers.host', 'localhost')
-
-    where:
-    tag                                       | userTracking
-    'appsec.events.users.login.success.track' | true
-    'appsec.events.users.login.failure.track' | true
-    'appsec.another.unrelated.tag'            | false
+    1 * traceSegment.setTagTop('_dd.appsec.fp.http.endpoint', 'xyz')
   }
 }