Fix frontend tests

Author: XanderVertegaal

frontend/src/app/annotate/annotation-input/problem-details/problem-details.component.spec.ts

@@ -16,9 +16,8 @@ const createMockProblem = (
     entailmentLabel,
     premises: ["premise"],
     hypothesis: "hypothesis",
-    kbItems: [],
-    labels: [],
     extraData,
+    annotations: null,
 });
 
 describe("ProblemDetailsComponent", () => {