Fix test build

Change If5ed52e53 renamed library rules, but did not update
the reference in lib/BUILD which caused the build to fail
when running:

  bazel test //...

The reference in the BUILD file is not used any more, so can
simply be removed.

Change-Id: I19227460a4a10afba051e80af28e9ac9e6b0f4b9
diff --git a/lib/BUILD b/lib/BUILD
index 29710ff..fe4988e 100644
--- a/lib/BUILD
+++ b/lib/BUILD
@@ -13,7 +13,6 @@
-    "jgit-archive-library",