move exports_files call into ts/BUILD.bazel

Suspect it has caused a regression when building from an external
repo.

ts/BUILD.bazel

@@ -23,6 +23,7 @@ exports_files([
     "rollup.config.js",
     ".eslintrc.js",
     "licenses.json",
+    "sql_format.ts",
 ])
 
 alias(

ts/sql_format.bzl

@@ -13,7 +13,6 @@ def sql_format_setup():
         ],
         visibility = ["//visibility:public"],
     )
-    native.exports_files(["sql_format.ts"])
 
 def sql_format(name = "sql_format", srcs = [], **kwargs):
     nodejs_test(