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/teyrchains/src/ump_tests.rs

@@ -214,8 +214,8 @@ mod check_upward_messages {
 				5
 			);
 			assert!(
-				configuration::ActiveConfig::<Test>::get().max_upward_queue_size <
-					crate::inclusion::MaxUmpMessageLenOf::<Test>::get(),
+				configuration::ActiveConfig::<Test>::get().max_upward_queue_size
+					< crate::inclusion::MaxUmpMessageLenOf::<Test>::get(),
 				"Test will not work"
 			);