Bazel: Format build file with buildifier

Change-Id: I62b56f1e66e09c7f481809b5894722da7a5ce07a

BUILD

diff --git a/BUILD b/BUILD
index c570584..8b11bd5 100644
--- a/BUILD
+++ b/BUILD
@@ -29,8 +29,8 @@
     name = "codemirror-element",
     srcs = [
         "gr-editor/codemirror-element.css",
-        "gr-editor/codemirror-element.js",
         "gr-editor/codemirror-element.html",
+        "gr-editor/codemirror-element.js",
     ],
     app = "gr-editor/codemirror-element.html",
     split = False,
@@ -43,4 +43,4 @@
     assets = [
         ":codemirror-element",
     ],
-)
\ No newline at end of file
+)