mkfadumprd: make _dracut_isolate_args an array
    
    upstream: fedora
    resolves: bz2003832
    conflict: none
    
    commit 982205d6072b1c10b2f0eff44c3ccbfa92dd3198
    Author: Kairui Song <kasong@redhat.com>
    Date:   Wed Aug 4 03:06:57 2021 +0800
    
        mkfadumprd: make _dracut_isolate_args an array
    
        To make arguments list work as expected, array is preferred.
    
        Check following link for details:
        https://github.com/koalaman/shellcheck/wiki/SC2089
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
        Acked-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>