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/xcm/xcm-pez-simulator/fuzzer/src/teyrchain.rs

@@ -238,8 +238,9 @@ pub mod mock_msg_queue {
 						max_weight,
 						Weight::zero(),
 					) {
-						Outcome::Error(InstructionError { error, .. }) =>
-							(Err(error), Event::Fail(Some(hash), error)),
+						Outcome::Error(InstructionError { error, .. }) => {
+							(Err(error), Event::Fail(Some(hash), error))
+						},
 						Outcome::Complete { used } => (Ok(used), Event::Success(Some(hash))),
 						// As far as the caller is concerned, this was dispatched without error, so
 						// we just report the weight used.