Don't use Files.copy() when decrypting to stdout

Files.copy() attempts to delete the file if it already exists, which obviously
won't work very well for /dev/stdout.  Instead copy directly from the decoder
to standard output.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=228384575

java/google/registry/tools/BUILD

@@ -92,6 +92,7 @@ java_library(
         "@com_google_oauth_client_jetty",
         "@com_google_re2j",
         "@com_googlecode_json_simple",
+        "@commons_io",
         "@io_bazel_rules_closure//closure/templates",
         "@jline",
         "@joda_time",