Fix: Wrong backgroundColor for profile initials

[JohannesDoberer]

Currently with the following settings (described below) the Initials has no backgroundColor:

Can be reproduced by the following steps:

1. index.html
   -> replace <link rel='stylesheet' href='/public/luigi.css'> with <link rel='stylesheet' href='/public/luigi_horizon.css'>
2. Luigi config:

settings: {
  ....
   responsiveNavigation: 'Fiori3',
   profileType: 'Fiori3',
   experimental: {
      profileMenuFiori3: true
   }
},
navigation: {
  ...nodes,
  profile: {
          logout: {
            label: 'Sign Out',
            icon: "sys-cancel"
          },
          staticUserInfoFn: () => {
            return new Promise(resolve => {
              resolve({
                name: 'Static User',
                initials: 'LU',
                email: 'other.luigi.user@example.com',
                description: 'Luigi Developer'
              });
            });
          }
        }
}

Expected:

[walmazacn]

LGTM 👍