Immutable variables are emitted in events

Description

The following immutable variables are unnecessarily included in event emissions:

• SyrupUserActions::_swap() - syrupUsdc in Swap event.
• MplUserActions::_redeemAndMigrateAndStake() - xmpl in RedeemedAndMigratedAndStaked event.

Recommendation

Immutable variables can not be changed, unless upgraded, so an event may not be necessary.