rustfmt: Drop lightning/src/offers/mod.rs from exclusion list

Author: tnull

rustfmt_excluded_files

@@ -38,7 +38,6 @@ lightning/src/ln/script.rs
 lightning/src/ln/shutdown_tests.rs
 lightning/src/ln/types.rs
 lightning/src/ln/wire.rs
-lightning/src/offers/mod.rs
 lightning/src/routing/mod.rs
 lightning/src/routing/router.rs
 lightning/src/routing/scoring.rs