metropolis/node: remove unused exports_files

This file is not used in other packages, so it doesn't need to be
exported.

Change-Id: I605447501bfb0667020caa72083058eff39a5ec6
Reviewed-on: https://review.monogon.dev/c/monogon/+/4563
Tested-by: Jenkins CI
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
diff --git a/metropolis/node/BUILD.bazel b/metropolis/node/BUILD.bazel
index d568e37..6168e48 100644
--- a/metropolis/node/BUILD.bazel
+++ b/metropolis/node/BUILD.bazel
@@ -33,10 +33,6 @@
     },
 )
 
-exports_files([
-    "passwd",
-])
-
 go_binary(
     name = "runc",
     embed = ["@com_github_opencontainers_runc//:runc_lib"],