Clarify wraithform skip-branch comment in affoff

[rodarvus]

Summary

In SpellupRecast/Hadar_Spellups.xml, the affoff() function has a loop that runs when wraithform (sn 180) drops. The loop iterates over Spellups["EX"]["wraithform"] and, for each related spell, checks table.find(v, Spellups["AF"]["list"]) — a truthy result means the player is currently affected by spell v. In that case the branch is intentionally a no-op (spell is still active, nothing to requeue); the else branch queues and recasts.

The original placeholder comment was --left empty becaue (typo, no explanation), which doesn't tell a reader why the branch is empty. This PR replaces it with a one-line comment describing the intent.

Before

if table.find(v,Spellups["AF"]["list"]) then
    --left empty becaue
else
    ...
end

After

if table.find(v,Spellups["AF"]["list"]) then
    -- spell v is still active on the player; no need to requeue
else
    ...
end

Test plan

• Comment-only change. No behavior is altered.

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