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/subsystem-util/src/inclusion_emulator/mod.rs

@@ -724,8 +724,9 @@ pub fn validate_commitments(
 	if commitments.new_validation_code.is_some() {
 		match constraints.upgrade_restriction {
 			None => {},
-			Some(UpgradeRestriction::Present) =>
-				return Err(FragmentValidityError::CodeUpgradeRestricted),
+			Some(UpgradeRestriction::Present) => {
+				return Err(FragmentValidityError::CodeUpgradeRestricted)
+			},
 		}
 	}