message: fix buildifier errors for BUILD
diff: @@ -319,10 +319,10 @@ cc_library(
  name = "tf_tstring",
  srcs = [
  "tf_tstring.cc",
  - "//tensorflow/core/platform:ctstring"
  + "//tensorflow/core/platform:ctstring",
  ],
  hdrs = ["tf_tstring.h"],
  - visibility = ["//visibility:public"]
  + visibility = ["//visibility:public"],
  )
  cc_library(
  