[lfmerge] Fix package build
[lfmerge] Fix package build

Also omit nightly suffix since GitVersion gives us a pre-release
tag now.

Change-Id: I910437456d4ef2b63d86381971f1341aa0174e89

sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts