bec8b47 coreos-download: fix navbar and stream dropdown

Authored and Committed by abai 4 years ago
    coreos-download: fix navbar and stream dropdown
    
    Fixes a bug that when the page re-renders, the navbar
    and stream selection dropdown are not consistent with
    the content shown in the main content section.
    
    To reproduce, select a platform in the navbar and select a
    different stream from dropdown. When the page re-renders,
    while the main content remains the same as user selected
    previously, the selected dropdown and navbar are refreshed
    with default values. The expected behaviour is that the
    refreshed value is consistent with the content selected by
    user.
    
    Signed-off-by: Allen Bai <abai@redhat.com>