Fix locale-specific time
    
    In `zpool status -t`, scrub date/time is reported using the C locale,

    while trim time is reported using the current one. This is inconsistent.

    This patch fixes that.

    

    Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>

    Reviewed-by: Tony Hutter <hutter2@llnl.gov>

    Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>

    Signed-off-by: Maxim Filimonov <che@bein.link>

    Closes #15878

    Closes #15879