Include `channel_keys.rs` in the rustfmt list

Since its already formatted and there's not much active work going
on in it.

diff --git a/rustfmt_excluded_files b/rustfmt_excluded_files
index a6a81a0f5862a368e60c491b8711616e71839ce6..51731c40d092dc3e706354c79e01568624569348 100644 (file)
--- a/rustfmt_excluded_files
+++ b/rustfmt_excluded_files
@@ -190,7 +190,6 @@
 ./lightning/src/ln/chanmon_update_fail_tests.rs
 ./lightning/src/ln/channel.rs
 ./lightning/src/ln/channel_id.rs
-./lightning/src/ln/channel_keys.rs
 ./lightning/src/ln/channelmanager.rs
 ./lightning/src/ln/features.rs
 ./lightning/src/ln/functional_test_utils.rs