Bug 8849 - Error log generated when not a demo system

Bug 8849 - Error log generated when not a demo system

Changed two lines similar to:
   unless (C4::Context->config('demo') == 1) {
into lines similar to:
   unless (C4::Context->config('demo')) {
By removing the == 1, undefined = false without an error. The
value of demo is supposedly set by a koha-conf.xml variable,
but there is very little documentation on this "demo mode"
beyond the set it to 1 in koha conf for demo mode.  Also, demo
doesn't exist in the default koha-conf.xml file generated.
So anyone who knows to create it, will likely create it the
proper way and with the proper value.

Signed-off-by: wajasu <matted-34813@mypacks.net>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>