Format all build files with buildifier

With the command:

  $ buildifier -r -lint fix -warnings all .

Change-Id: I8fb38072b103c86bedd5be0a2cfffa771b43af87

tools/BUILD

diff --git a/tools/BUILD b/tools/BUILD
index 4a9f11e..ab2b9b3 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -1,9 +1,9 @@
-load("@rules_java//java:defs.bzl", "java_package_configuration")
 load(
     "@bazel_tools//tools/jdk:default_java_toolchain.bzl",
     "JDK9_JVM_OPTS",
     "default_java_toolchain",
 )
+load("@rules_java//java:defs.bzl", "java_package_configuration")
 
 default_java_toolchain(
     name = "error_prone_warnings_toolchain",