IntoSystemConfigs::chain_ignore_deferred's return type fix (#13919)

# Objective

Fixes #13917 

## Solution

Changed `IntoSystemSetConfigs::chain_ignore_deferred`'s return type from
`SystemConfigs` to `SystemSetConfigs`

## Testing

Tried to run the `ecs_guide` example, where `chain` method is replaced
by `chain_ignore_deferred` method

---

crates/bevy_ecs/src/schedule/config.rs

@@ -650,7 +650,7 @@ where
  /// Ordering constraints will be applied between the successive elements.
  ///
  /// Unlike [`chain`](Self::chain) this will **not** add [`apply_deferred`](crate::schedule::apply_deferred) on the edges.
- fn chain_ignore_deferred(self) -> SystemConfigs {
+ fn chain_ignore_deferred(self) -> SystemSetConfigs {
  self.into_configs().chain_ignore_deferred()
  }
 }
@@ -721,6 +721,10 @@ impl IntoSystemSetConfigs for SystemSetConfigs {
  fn chain(self) -> Self {
  self.chain_inner()
  }
+
+ fn chain_ignore_deferred(self) -> Self {
+ self.chain_ignore_deferred_inner()
+ }
 }
 
 impl<S: SystemSet> IntoSystemSetConfigs for S {