Remove 'source_under_test' from java_test rule

Change-Id: I4091e0c8241cbc8b3c9347c524d6efbe511197a2
diff --git a/BUCK b/BUCK
index 409fd6d..f504e08 100644
--- a/BUCK
+++ b/BUCK
@@ -69,9 +69,8 @@
   name = 'lfs_tests',
   srcs = glob(['src/test/java/**/*.java']),
   labels = ['lfs'],
-  source_under_test = [':lfs__plugin'],
   deps = GERRIT_PLUGIN_API + GERRIT_TESTS + [
     ':lfs__plugin',
     '//plugins/lfs:jgit-lfs',
   ],
-)
\ No newline at end of file
+)