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/runtime/common/src/mock.rs

@@ -163,8 +163,9 @@ impl<T: pezframe_system::Config> Registrar for TestRegistrar<T> {
 		PARATHREADS.with(|x| {
 			let mut parathreads = x.borrow_mut();
 			match parathreads.binary_search(&id) {
-				Ok(_) =>
-					Err(DispatchError::Other("already parathread, so cannot `make_parathread`")),
+				Ok(_) => {
+					Err(DispatchError::Other("already parathread, so cannot `make_parathread`"))
+				},
 				Err(i) => {
 					parathreads.insert(i, id);
 					Ok(())