Bazel: Automatically fix lint errors with buildifier

In recent buildifier versions, lint errors can be fixed automatically:

  $ find . \( -name BUILD -o -name "*.bzl" \) -print \
      | xargs buildifier --lint=fix

This commit was created with Buildifier version 0.22.0:

  $ buildifier --version
buildifier version: 0.22.0
buildifier scm revision: 55b64c3d2ddfb57f06477c1d94ef477419c96bd6

Change-Id: I01c0a9ff5418270e86f3f9206c4c89fa8d174553
diff --git a/BUILD b/BUILD
index 1ab2083..668641e 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 = "hide-actions",