Fixes build_release.sh issue when using leiningen v2.3

latest version of leiningen breaks bin/build_release.sh creating zip without jar files. This fixes it by forcing lein to store jar in the same path it use to, target/... instead of target/profile-name/...

Steps to reproduce:
1. invoke bin/build_release.sh with leiningen version = 2.3.2+, you will see the zip file does not contain any jars.