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

pezcumulus/test/runtime/src/genesis_config_presets.rs

@@ -59,9 +59,10 @@ pub fn preset_names() -> Vec<PresetId> {
 /// Provides the JSON representation of predefined genesis config for given `id`.
 pub fn get_preset(id: &PresetId) -> Option<Vec<u8>> {
 	let patch = match id.as_ref() {
-		pezsp_genesis_builder::DEV_RUNTIME_PRESET |
-		pezsp_genesis_builder::LOCAL_TESTNET_RUNTIME_PRESET =>
-			testnet_genesis_with_default_endowed(100.into()),
+		pezsp_genesis_builder::DEV_RUNTIME_PRESET
+		| pezsp_genesis_builder::LOCAL_TESTNET_RUNTIME_PRESET => {
+			testnet_genesis_with_default_endowed(100.into())
+		},
 		_ => return None,
 	};
 	Some(