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/babe/src/tests.rs

@@ -251,8 +251,8 @@ fn can_estimate_current_epoch_progress() {
 				);
 			} else {
 				assert!(
-					Babe::estimate_current_session_progress(i).0.unwrap() <
-						Permill::from_percent(100)
+					Babe::estimate_current_session_progress(i).0.unwrap()
+						< Permill::from_percent(100)
 				);
 			}
 		}