empty version in launcher dependency name

When computing the bundles, the launche version is empty.

This inserts the following in the install.xml files:

<copy overwrite="true" file="${package.root}/install/bin/nuxeo-launcher--HF14-jar-with-dependencies.jar" tofile="${env.server.home}/bin/nuxeo-launcher.jar" />

This is due to wrong variable in computeBundle TARGET_VERSION, which is the one from the test, thus working in tests but failing in real case scenario.