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/client/relay-chain-streams/src/lib.rs

@@ -78,8 +78,8 @@ pub async fn pending_candidates(
 
 			// If the relay chain runtime does not support the new runtime API, fallback to the
 			// deprecated one.
-			let pending_availability_result = if teyrchain_host_runtime_api_version <
-				RuntimeApiRequest::CANDIDATES_PENDING_AVAILABILITY_RUNTIME_REQUIREMENT
+			let pending_availability_result = if teyrchain_host_runtime_api_version
+				< RuntimeApiRequest::CANDIDATES_PENDING_AVAILABILITY_RUNTIME_REQUIREMENT
 			{
 				#[allow(deprecated)]
 				client