test: update useDataSaver test to match formatted JSON output

Author: p-eye

frontend/src/lib/hooks/__tests__/useDataSaver.spec.tsx

@@ -59,7 +59,7 @@ describe('useDataSaver hook', () => {
       };
       render(<HookWrapper />);
       expect(navigator.clipboard.writeText).toHaveBeenCalledWith(
-        JSON.stringify(content)
+        JSON.stringify(content, null, '\t')
       );
     });