Fix AGameModeBase::GetGameSessionClass

AGameModeBase::GetGameSessionClass wasn't properly returning the set GameSessionClass.

1. Create a new project.
2. Change GameSessionClass on the Game Mode
3. Call GetGameSessionClass on the Game mode.

Expected: GetGameSessionClass returns the GameSession subclass set on GameSessionClass.
Actual: GetGameSessionClass always returns AGameSession::StaticClass()

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