fix(esx_menu_dialog): drop the timeout id bookkeeping

With the callback checking whether a menu is still open, cancelling the
previous timers by id is no longer needed.

The table it kept them in was never emptied, so every open iterated over
every id ever created and called ClearTimeout on all of them. That is
quadratic, and clearTimeout only marks an id in xLib's CancelledTimeouts,
which is cleared when the timer fires. Ids that had already fired stayed
in there for good, in a table shared by every resource.

[core]/esx_menu_dialog/client/main.lua

@@ -1,10 +1,6 @@
-local Timeouts, OpenedMenus, MenuType = {}, {}, "dialog"
+local OpenedMenus, MenuType = {}, "dialog"
 
 local function openMenu(namespace, name, data)
-    for i = 1, #Timeouts, 1 do
-        ESX.ClearTimeout(Timeouts[i])
-    end
-
     OpenedMenus[namespace .. "_" .. name] = true
 
     SendNUIMessage({
@@ -14,13 +10,11 @@ local function openMenu(namespace, name, data)
         data = data,
     })
 
-    local timeoutId = ESX.SetTimeout(200, function()
+    ESX.SetTimeout(200, function()
         if next(OpenedMenus) then
             SetNuiFocus(true, true)
         end
     end)
-
-    table.insert(Timeouts, timeoutId)
 end
 
 local function closeMenu(namespace, name)