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/primitives/inherents/src/lib.rs

@@ -367,9 +367,9 @@ impl CheckInherentsResult {
 #[cfg(feature = "std")]
 impl PartialEq for CheckInherentsResult {
 	fn eq(&self, other: &Self) -> bool {
-		self.fatal_error == other.fatal_error &&
-			self.okay == other.okay &&
-			self.errors.data == other.errors.data
+		self.fatal_error == other.fatal_error
+			&& self.okay == other.okay
+			&& self.errors.data == other.errors.data
 	}
 }