style: fix linting issues met Prettier

frontend/vitest.config.ts

@@ -10,7 +10,7 @@ export default mergeConfig(
             exclude: [...configDefaults.exclude, "e2e/**"],
             root: fileURLToPath(new URL("./", import.meta.url)),
             // Startup the backend server, because it is needed for some tests
-            globalSetup: [ "./tests/setup-backend.ts" ]
+            globalSetup: ["./tests/setup-backend.ts"],
         },
     }),
 );