fix fold -b with UTF8 locale
    
    Fixes the following incorrect behaviour of fold caused by the i18n patch:
    ```
    $ LC_ALL=en_US.UTF-8 fold -b -w6 <<<  $'1234567890\nabcdefghij\n1234567890\n'
    123456
    7890
    a
    bcdefg
    hij
    12
    345678
    90
    ```
    
    Fixes: 97967f71c8772354f87dfff4edfe24fb213c8557 ("coreutils-i18n.patch: synchronize the patch with openSUSE")
    Resolves: RHE L-60295