Fix formatter on main branch

Change-Id: I47e0842866f3e7864498a6cb152f45ff6a6a6964
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/25260
Reviewed-by: Takuto Ikuta <tikuta@google.com>
Commit-Queue: Matt Stark <msta@google.com>

src/gn/starlark/crates/rule/src/frozen_rule.rs

diff --git a/src/gn/starlark/crates/rule/src/frozen_rule.rs b/src/gn/starlark/crates/rule/src/frozen_rule.rs
index cb9442f..d24fc77 100644
--- a/src/gn/starlark/crates/rule/src/frozen_rule.rs
+++ b/src/gn/starlark/crates/rule/src/frozen_rule.rs
@@ -144,4 +144,3 @@
         write!(f, "<rule: {}>", &self.name)
     }
 }
-