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

pezbridges/primitives/relayers/src/registration.rs

@@ -71,8 +71,9 @@ impl<AccountId: Decode + Encode, LaneId: Decode + Encode> IdentifyAccount
 	fn into_account(self) -> Self::AccountId {
 		match self {
 			ExplicitOrAccountParams::Explicit(account_id) => account_id,
-			ExplicitOrAccountParams::Params(params) =>
-				PayRewardFromAccount::<(), AccountId, LaneId, ()>::rewards_account(params),
+			ExplicitOrAccountParams::Params(params) => {
+				PayRewardFromAccount::<(), AccountId, LaneId, ()>::rewards_account(params)
+			},
 		}
 	}
 }