Export installed fonts path in run-luna-sysmgr.sh

Fonts used by luna-sysmgr and applications (Prelude etc.) were installed
into luna-desktop-binaries/rootfs/usr/share/fonts but luna-sysmgr looked
for them in luna-desktop-binaries/staging/lib/fonts, where a different
set of fonts was installed. Because of this wrong fonts were used
everywhere.

This change fixes OWEBOS-3092 where a non-Unicode font was used instead
of a Unicode font.

Open-webOS-DCO-1.0-Signed-off-by: Teppo Pennanen <teppo.pennanen@palm.com>

Change-Id: I47da9ec7027d15016daaeab04d91dda11f353a86
Reviewed-on: http://g2g.palm.com/1362
Reviewed-by: Build Verification
Reviewed-by: Teppo Pennanen <teppo.pennanen@palm.com>
Tested-by: Teppo Pennanen <teppo.pennanen@palm.com>
Reviewed-by: Jukka Honkela <jukka.honkela@palm.com>
Reviewed-by: Roger Stringer <roger.stringer@palm.com>