SYSAPPEND: Fix space stripping

The description of SYSAPPEND for the DMI information states that the spaces
are replaced by underscores, but this replacement does not occur in 6.03.

Signed-off-by: Dany St-Amant <dany.ephemeral.2014@icloud.com>
Signed-off-by: Gene Cumm <gene.cumm@gmail.com>