Allow passing arguments to fmt, do not pass filenames

.pre-commit-hooks.yaml

@@ -1,10 +1,10 @@
 -   id: fmt
     name: fmt
     description: Format files with cargo fmt.
-    entry: cargo fmt --
+    entry: cargo fmt
     language: system
     types: [rust]
-    args: []
+    pass_filenames: false
 -   id: cargo-check
     name: cargo check
     description: Check the package for errors.