bus-message: also properly copy struct signature when skipping
    
    The change is similar to that in the previous commit, but I don't have
    a reproducer / test case case for this one, so I'm keeping it seperate.
    
    (cherry picked from commit 3d338a302f56c0ef0445660d9856794abe1af8b5)
    
    Resolves: #1696224
    
    patch_name: 0173-bus-message-also-properly-copy-struct-signature-when.patch
    present_in_specfile: true
    location_in_specfile: 173
    squash_commits: true