Remove/fix channel list code

[spiralofhope]

In tekticles.lua lines 90-94, there is some broken code:

	for i=1,MAX_CHANNEL_BUTTONS do
		local f = _G["ChannelButton"..i.."Text"]
		f:SetFontObject(GameFontNormalSmallLeft)
		-- function f:SetFont(...) error("Attempt to set font on ChannelButton"..i) end
	end

MAX_CHANNEL_BUTTONS can be replaced with GetNumDisplayChannels() to fix one error.

	for i=1,GetNumDisplayChannels() do
		local f = _G["ChannelButton"..i.."Text"]
		f:SetFontObject(GameFontNormalSmallLeft)
		-- function f:SetFont(...) error("Attempt to set font on ChannelButton"..i) end
	end

However, I still get an error with f. Commenting-out this block of code resolves that and doesn't seem to remove any functionality.