feat: remove unnecessary condition in App component (#3107)

The unnecessary condition in the App component was causing the error modal to not appear when there was an error in the health data. This commit removes the unnecessary condition to ensure that the error modal is displayed correctly.

src/frontend/src/App.tsx

@@ -137,7 +137,6 @@ export default function App() {
               message={FETCH_ERROR_MESSAGE}
               openModal={
                 isErrorHealth ||
-                !healthData ||
                 (healthData &&
                   Object.values(healthData).some((value) => value !== "ok"))
               }