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/balances/src/impl_currency.rs

@@ -835,8 +835,9 @@ where
 		if slashed == beneficiary {
 			return match status {
 				Status::Free => Ok(Self::unreserve_named(id, slashed, value)),
-				Status::Reserved =>
-					Ok(value.saturating_sub(Self::reserved_balance_named(id, slashed))),
+				Status::Reserved => {
+					Ok(value.saturating_sub(Self::reserved_balance_named(id, slashed)))
+				},
 			};
 		}