projectw.sh: fix path to external config files for rfserver

The paths for the external (non-default) config files was missing
a '/' which meant that the startup script would never find the
external config files and would always use the default files in /tmp.

Signed-off-by: Stacey Sheldon <stac@corsa.com>
Merge pull request #17 from solidgoldbomb/rfserver-config-path-fix

projectw.sh: fix path to external config files for rfserver