style: Migrate to stable-only rustfmt configuration

- Remove nightly-only features from .rustfmt.toml and vendor/ss58-registry/rustfmt.toml
- Removed features: imports_granularity, wrap_comments, comment_width,
  reorder_impl_items, spaces_around_ranges, binop_separator,
  match_arm_blocks, trailing_semicolon, trailing_comma
- Format all 898 affected files with stable rustfmt
- Ensures long-term reliability without nightly toolchain dependency

pezkuwi/xcm/pezpallet-xcm-benchmarks/src/mock.rs

@@ -50,8 +50,9 @@ pub struct AccountIdConverter;
 impl xcm_executor::traits::ConvertLocation<u64> for AccountIdConverter {
 	fn convert_location(ml: &Location) -> Option<u64> {
 		match ml.unpack() {
-			(0, [Junction::AccountId32 { id, .. }]) =>
-				Some(<u64 as codec::Decode>::decode(&mut &*id.to_vec()).unwrap()),
+			(0, [Junction::AccountId32 { id, .. }]) => {
+				Some(<u64 as codec::Decode>::decode(&mut &*id.to_vec()).unwrap())
+			},
 			_ => None,
 		}
 	}