Don't use std::shared_ptr in ScriptInterface

Differential Revision: https://code.wildfiregames.com/D5159
This was SVN commit r27945.

source/network/NetServer.cpp

@@ -445,7 +445,7 @@ bool CNetServerWorker::RunStep()
 	// (Do as little work as possible while the mutex is held open,
 	// to avoid performance problems and deadlocks.)
 
-	m_ScriptInterface->GetContext()->MaybeIncrementalGC(0.5f);
+	m_ScriptInterface->GetContext().MaybeIncrementalGC(0.5f);
 
 	ScriptRequest rq(m_ScriptInterface);