Format code using rustfmt 1.5.0

Github actions recently updated rustfmt to v1.5.0, this commit
formats the code accordingly so that CI doesn't fail.

Author: danielabrozzoni

src/wallet/mod.rs

@@ -589,14 +589,12 @@ where
         )?;
         let internal_requirements = internal_policy
             .map(|policy| {
-                Ok::<_, Error>(
-                    policy.get_condition(
-                        params
-                            .internal_policy_path
-                            .as_ref()
-                            .unwrap_or(&BTreeMap::new()),
-                    )?,
-                )
+                Ok::<_, Error>(policy.get_condition(
+                    params
+                        .internal_policy_path
+                        .as_ref()
+                        .unwrap_or(&BTreeMap::new()),
+                )?)
             })
             .transpose()?;