Bazel: Reformat BUILD file with buildifier 0.17.2

Change-Id: I8d48f0bcbdd33f5ff51fadc9cdd6a3aa623ec8c5

BUILD

diff --git a/BUILD b/BUILD
index 7ba3d26..59f8856 100644
--- a/BUILD
+++ b/BUILD
@@ -1,5 +1,5 @@
 load("//tools/bzl:junit.bzl", "junit_tests")
-load("//tools/bzl:plugin.bzl", "gerrit_plugin", "PLUGIN_DEPS", "PLUGIN_TEST_DEPS")
+load("//tools/bzl:plugin.bzl", "PLUGIN_DEPS", "PLUGIN_TEST_DEPS", "gerrit_plugin")
 
 gerrit_plugin(
     name = "replication",