dracut-module-setup.sh: remove an unused variable
    
    upstream: fedora
    resolves: bz2003832
    conflict: none
    
    commit ba7aa447b25f2c66f48ff7ca4a139eb39e4f2340
    Author: Kairui Song <kasong@redhat.com>
    Date:   Wed Aug 4 14:29:10 2021 +0800
    
        dracut-module-setup.sh: remove an unused variable
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
        Acked-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>