WebUI: update favicon.ico

I noticed that FreeIPA favicon is a bit squished. I would like to unsquish it.
And resize it to 32x32 pixels as it would look a bit better on HiDPI screens.

Fixes: https://pagure.io/freeipa/issue/9449

Signed-off-by: Viktor Ashirov <vashirov@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Carla Martinez <carlmart@redhat.com>