Fix: Iterator filter fails to properly filter key-value pairs

[IntegralsGetYouArea]

No description provided.

[YetAnotherClown]

Just a few changes are being requested for style consistency. Besides the comments, another thing to do is to move local filteredSnapshot = {} and snapshot = filtered_snapshot into the if statement, otherwise if no filter is provided then nothing will ever be returned.

The resulting code should look like:

-- When a filter is supplied, a new snapshot is created containing only filtered key-pair values
if filter then
	local filteredSnapshot = {}

	for k, v in snapshot do
		local filtered = filter(v)
		
		if filtered then
			table.insert(filteredSnapshot, v)
		end
	end

	snapshot = filteredSnapshot
end