Bazel: Remove unused java_library import

Change-Id: If8a38c325aa9780bbb5e3caa06f839030c0f3c03

BUILD

diff --git a/BUILD b/BUILD
index 8830a9f..e45eca3 100644
--- a/BUILD
+++ b/BUILD
@@ -1,4 +1,3 @@
-load("@rules_java//java:defs.bzl", "java_library")
 load("//tools/bzl:genrule2.bzl", "genrule2")
 load("//tools/bzl:plugin.bzl", "gerrit_plugin")