Fix AutoTarget ignoring frozen actor bot targeting hack

[PunkPun]

The behaviour mismatch can cause an AI unit which has attack range longer that vision range to freeze in place. The check added in db2fded made the bug less common, but as #20257 was merged the checks now hide the bug in way fewer cases

The fix is to mirror these checks to AutoTarget

OpenRA/OpenRA.Mods.Common/TargetExtensions.cs

Lines 42 to 57 in c093e7c

	// Bot-controlled units aren't yet capable of understanding visibility changes
	if (viewer.IsBot)
	{
	// Prevent that bot-controlled units endlessly fire at frozen actors.
	// TODO: Teach the AI to support long range artillery units with units that provide line of sight
	if (t.Type == TargetType.FrozenActor)
	{
	if (t.FrozenActor.Actor != null)
	return Target.FromActor(t.FrozenActor.Actor);
	// Original actor was killed
	return Target.Invalid;
	}
	return t;
	}

[PunkPun]

Reproducing the bug may prove difficult, I just confirmed it by seeing that the replay containing the bug got out of sync the exact moment when the bug was supposed to happen

[Mailaender]

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