Revert the copy of the lizmapdemo module
Revert the copy of the lizmapdemo module

The latest Jelix 1.7 has fixed the support of `<module>.path` into
the configuration, so we can use it again to install the lizmapdemo module
from the extra-modules directory.

nboisteault/lizmap-web-client,laurentj/lizmap-web-client,rldhont/lizmap-web-client,rldhont/lizmap-web-client,rldhont/lizmap-web-client,laurentj/lizmap-web-client,3liz/lizmap-web-client,3liz/lizmap-web-client,3liz/lizmap-web-client,laurentj/lizmap-web-client,laurentj/lizmap-web-client,nboisteault/lizmap-web-client,3liz/lizmap-web-client,nboisteault/lizmap-web-client,rldhont/lizmap-web-client,nboisteault/lizmap-web-client