Remove ScriptContext::CreateContext

This function nudges one into using it instead of the constructor. Even
though a `std::shared_ptr` isn't required.

source/ps/GameSetup/GameSetup.cpp

@@ -555,7 +555,7 @@ bool Init(const CmdLineArgs& args, int flags)
 	// their own threads and also their own contexts.
 	const int contextSize = 384 * 1024 * 1024;
 	const int heapGrowthBytesGCTrigger = 12 * 1024 * 1024;
-	g_ScriptContext = ScriptContext::CreateContext(contextSize, heapGrowthBytesGCTrigger);
+	g_ScriptContext = std::make_shared<ScriptContext>(contextSize, heapGrowthBytesGCTrigger);
 
 	// On the first Init (INIT_MODS), check for command-line arguments
 	// or use the default mods from the config and enable those.