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/client/transaction-pool/api/src/lib.rs

@@ -162,11 +162,11 @@ impl<Hash, BlockHash> TransactionStatus<Hash, BlockHash> {
 	pub fn is_final(&self) -> bool {
 		// The state must be kept in sync with `crate::graph::Sender`.
 		match self {
-			Self::Usurped(_) |
-			Self::Finalized(_) |
-			Self::FinalityTimeout(_) |
-			Self::Invalid |
-			Self::Dropped => true,
+			Self::Usurped(_)
+			| Self::Finalized(_)
+			| Self::FinalityTimeout(_)
+			| Self::Invalid
+			| Self::Dropped => true,
 			_ => false,
 		}
 	}