rustfmt: Drop routing/router.rs from exclusion list

Author: tnull

rustfmt_excluded_files

@@ -67,7 +67,6 @@ lightning/src/onion_message/mod.rs
 lightning/src/onion_message/offers.rs
 lightning/src/onion_message/packet.rs
 lightning/src/routing/mod.rs
-lightning/src/routing/router.rs
 lightning/src/routing/scoring.rs
 lightning/src/routing/test_utils.rs
 lightning/src/routing/utxo.rs