[BUG] CSS properties from FronteggThemeOptions.adminPortal.pages[pageName].header are not applied

[iurii-iufimov-forgood]

Describe the bug

I'm trying to add css-overrides to the embedded adminPortal. It turned out, that css-overrides for headers of individual pages are not applied

To Reproduce

const themeOptions: FronteggThemeOptions = {
  adminPortal: {
    layout: {
      fullScreenMode: true,
    },
    pages: {
      profile: {
        header: {
          // Not applied
          background: 'red',
        },
        content: {
          // Applied
          background: 'red',
        }
      }
    },
  },
};

const root = ReactDOM.createRoot(document.getElementById('root') as HTMLElement);
root.render(
  <React.StrictMode>
    <FronteggProvider
      contextOptions={contextOptions}
      hostedLoginBox={false}
      themeOptions={themeOptions}
    >
      <App />
    </FronteggProvider>
  </React.StrictMode>
);

Expected behavior
Css properties should be applied to header

Screenshots