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/xcm-builder/src/asset_conversion.rs

@@ -41,8 +41,8 @@ impl<
 		let prefix = Prefix::get();
 		let latest_prefix: Location = prefix.try_into().ok()?;
 		let latest_id: Location = (*id).clone().try_into().ok()?;
-		if latest_prefix.parent_count() != latest_id.parent_count() ||
-			latest_prefix
+		if latest_prefix.parent_count() != latest_id.parent_count()
+			|| latest_prefix
 				.interior()
 				.iter()
 				.enumerate()
@@ -149,8 +149,9 @@ impl<
 {
 	fn matches_nonfungibles(a: &Asset) -> result::Result<(ClassId, InstanceId), MatchError> {
 		let (instance, class) = match (&a.fun, &a.id) {
-			(NonFungible(ref instance), AssetId(ref class)) if MatchClassId::contains(class) =>
-				(instance, class),
+			(NonFungible(ref instance), AssetId(ref class)) if MatchClassId::contains(class) => {
+				(instance, class)
+			},
 			_ => return Err(MatchError::AssetNotHandled),
 		};
 		let what = ConvertClassId::convert(class).ok_or(MatchError::AssetIdConversionFailed)?;