Automatically format all build files with buildifier lint mode

Use the -lint=fix option to automatically format files.

buildifier version: 0.20.0
buildifier scm revision: db073457c5a56d810e46efc18bb93a4fd7aa7b5e

Change-Id: Ie684997f2ba394e7f4f981a2df393dd646fcadef

tools/maven/BUILD

diff --git a/tools/maven/BUILD b/tools/maven/BUILD
index 50a343d..eecdda0 100644
--- a/tools/maven/BUILD
+++ b/tools/maven/BUILD
@@ -1,5 +1,5 @@
-load("//:version.bzl", "GITILES_VERSION")
 load("@com_googlesource_gerrit_bazlets//tools/maven:package.bzl", "maven_package")
+load("//:version.bzl", "GITILES_VERSION")
 
 maven_package(
     src = {