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

pezbridges/relays/lib-bizinikiwi-relay/src/teyrchains/target.rs

@@ -197,8 +197,9 @@ where
 		let storage_value: Option<ParaStoredHeaderData> =
 			self.target_client.storage_value(at_block.hash(), storage_key).await?;
 		let para_head_number = match storage_value {
-			Some(para_head_data) =>
-				para_head_data.decode_teyrchain_head_data::<P::SourceTeyrchain>()?.number,
+			Some(para_head_data) => {
+				para_head_data.decode_teyrchain_head_data::<P::SourceTeyrchain>()?.number
+			},
 			None => return Ok(None),
 		};