Fix bug in previous change which broke path mapping.

Downstream users like Angular need to import @bazel/typescript.

PiperOrigin-RevId: 187553081
diff --git a/internal/BUILD.bazel b/internal/BUILD.bazel
index ea9af5d..ea5005b 100644
--- a/internal/BUILD.bazel
+++ b/internal/BUILD.bazel
@@ -38,7 +38,7 @@
       "tsetse/rules/*.ts"
     ], exclude=["**/test_support.ts", "**/*_test.ts"]),
     module_name = "@bazel/typescript",
-    module_root = "index.d.ts",
+    module_root = "tsc_wrapped/index.d.ts",
     tsconfig = "//internal:tsc_wrapped/tsconfig.json",
     visibility = ["//visibility:public"],
     data = [