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/modules/messages/src/tests/messages_generation.rs

@@ -78,12 +78,13 @@ where
 		for (i, nonce) in message_nonces.into_iter().enumerate() {
 			let message_key = MessageKey { lane_id: lane, nonce };
 			let message_payload = match encode_message(nonce, &generate_message(nonce)) {
-				Some(message_payload) =>
+				Some(message_payload) => {
 					if i == 0 {
 						grow_storage_value(message_payload, &proof_params)
 					} else {
 						message_payload
-					},
+					}
+				},
 				None => continue,
 			};
 			let storage_key = storage_keys::message_key(