qemu: Fix virQEMUCapsCommands formatting
    
    Starting with commit id 'fab9d6e1' the formatting of:
    
    { "command-name", QEMU_CAPS_NAME },
    
    was altered to:
    
    { "command-name", QEMU_CAPS_NAME},
    
    and then commit id 'e2b05c9a' altered that to:
    
    { "command-name", QEMU_CAPS_NAME}
    
    So, let's just fix that up to make things consistent with the
    rest of the structures.
    
    Signed-off-by: John Ferlan <jferlan@redhat.com>