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

pezcumulus/teyrchains/runtimes/assets/common/src/migrations.rs

@@ -113,8 +113,9 @@ pub mod foreign_assets_reserves {
 					// At first, start migrating assets.
 					None => Self::asset_step(None),
 					// Migrate any remaining assets.
-					Some(MigrationState::Asset(maybe_last_asset)) =>
-						Self::asset_step(Some(maybe_last_asset)),
+					Some(MigrationState::Asset(maybe_last_asset)) => {
+						Self::asset_step(Some(maybe_last_asset))
+					},
 					// After the last asset, migration is finished.
 					Some(MigrationState::Finished) => {
 						tracing::info!(target: "runtime::ForeignAssetsReservesMigration", "migration finished");