Refactor GetChannelId out of FindOrJoinChannel

No reason for it to be nested

Modules/Messenger.lua

@@ -13,7 +13,6 @@ function shared.Messenger.Init()
 	---@type table<string, number>
 	local channelIdMap = {}
 
-	local function FindOrJoinChannel(channelName, password)
 	local function GetChannelId(channelName)
 		local channels = { GetChannelList() }
 		for i = 1, #channels, 2 do
@@ -25,6 +24,7 @@ function shared.Messenger.Init()
 		end
 	end
 
+	local function FindOrJoinChannel(channelName, password)
 		local channelId = GetChannelId(channelName)
 		if not channelId then
 			print("Channel", tostring(channelName), "not found, joining")