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/pezframe/grandpa/src/equivocation.rs

@@ -213,8 +213,8 @@ where
 
 		// Check that the session id for the membership proof is within the
 		// bounds of the set id reported in the equivocation.
-		if session_index > set_id_session_index ||
-			previous_set_id_session_index
+		if session_index > set_id_session_index
+			|| previous_set_id_session_index
 				.map(|previous_index| session_index <= previous_index)
 				.unwrap_or(false)
 		{