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

bizinikiwi/pezframe/staking-async/src/benchmarking.rs

@@ -1230,8 +1230,8 @@ mod benchmarks {
 			.for_each(|validator| {
 				let exposure = pezsp_staking::Exposure::<T::AccountId, BalanceOf<T>> {
 					own: T::Currency::minimum_balance(),
-					total: T::Currency::minimum_balance() *
-						(exposed_nominators_per_validator + 1).into(),
+					total: T::Currency::minimum_balance()
+						* (exposed_nominators_per_validator + 1).into(),
 					others: (0..exposed_nominators_per_validator)
 						.map(|n| {
 							let nominator = account::<T::AccountId>("nominator", n, SEED);