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 5b4896f..cfb4b60 100644
--- a/BUILD
+++ b/BUILD
@@ -44,6 +44,6 @@
         "**/*.html",
         "**/*.js",
     ]),
-    plugin_name = "simple-submit-rules",
     app = "plugin.html",
+    plugin_name = "simple-submit-rules",
 )