Fix dynamic call screwing up values

[mitrokosta]

ExpressionResult may contain a reference to an object after returning from BC_CallFunction. Script example that insta crashes the game before this fix (most of the time, sometimes it hides MC's portrait):

void Suicide()
{
	ref sld = CharacterFromID("Blaze");
}

void ActiveF10Control()
{
	string death = "Suicide";
	call death();
}

Suicide() caused ExpressionResult to have a reference to an object (reference to main character). ExpressionResult.Set(0); sets the object's type to int which is obviously bad.

[q4a]

Linux fail because of Clang 12 removed from Ubuntu 22.04 CI image: actions/runner-images#8263
I'll try to fix CI today.