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

pezkuwi/node/core/av-store/src/tests.rs

@@ -1263,8 +1263,8 @@ async fn has_all_chunks(
 	expect_present: bool,
 ) -> bool {
 	for i in 0..n_validators {
-		if query_chunk(virtual_overseer, candidate_hash, ValidatorIndex(i)).await.is_some() !=
-			expect_present
+		if query_chunk(virtual_overseer, candidate_hash, ValidatorIndex(i)).await.is_some()
+			!= expect_present
 		{
 			return false;
 		}