Various code fixes detected by luacheck

* Luablock: Fix the missing position argument when executing the lua code fails
* Wireless: Fix the missing id argument
* Localize several variables
* Some other small changes, e.g. dead code removal

moremesecons_teleporter/init.lua

@@ -24,12 +24,12 @@ local function teleport_nearest(pos)
 
 	-- Search for the nearest player
 	local nearest = nil
-	local min_distance = MAX_PLAYER_DISTANCE
+	local min_distance_player = MAX_PLAYER_DISTANCE
 	local players = minetest.get_connected_players()
 	for _, player in pairs(players) do
 		local distance = vector.distance(pos, player:getpos())
-		if distance <= min_distance then
-			min_distance = distance
+		if distance <= min_distance_player then
+			min_distance_player = distance
 			nearest = player
 		end
 	end