format the code with `cargo fmt --all`

This should make the `format` job happy.

> see https://gitlab.isae-supaero.fr/a.stevan/poly-commit/-/jobs/8238

src/kzg10/mod.rs

@@ -422,10 +422,7 @@ where
         }
     }
 
-    pub fn check_hiding_bound(
-        hiding_poly_degree: usize,
-        num_powers: usize,
-    ) -> Result<(), Error> {
+    pub fn check_hiding_bound(hiding_poly_degree: usize, num_powers: usize) -> Result<(), Error> {
         if hiding_poly_degree == 0 {
             Err(Error::HidingBoundIsZero)
         } else if hiding_poly_degree >= num_powers {