NiagaraComponent attached to the character won't stay active when travelling to a new level using seamless travel

The pawn character is added to APlayerController::GetSeamlessTravelActorList, so it'll be persisted during server travel.

The Niagara component is spawned during BeginPlay and activated manually. When traveling to MapB, it got deactivated, which won't happen if we are using a ParticleSystemComponent. Maybe we need a bWasActive variable to record its state in OnUnRegister, like what we did in the UParticleSystemComponent.

Test Project(4.27 C++): [Link Removed]

Steps to Reproduce: [Link Removed]

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