fix(esx_menu_dialog, esx_menu_list): do not grab NUI focus after the menu closed

Opening a menu schedules SetNuiFocus(true, true) 200 ms later so the NUI has time
to render. Closing sets the focus off but does not cancel that timer, so a menu
closed within those 200 ms leaves the timer to fire afterwards and turn the focus
back on with nothing open: the player gets a cursor and loses movement and input
until another menu is opened and closed. esx_menu_list never stored the timer id
at all, so it could not be cancelled in any case.

Checking inside the callback whether a menu is still open fixes both, and also
covers a quick open-close-open where cancelling by id would drop a focus that is
still wanted. esx_menu_default is unaffected, it has no timer.

Tested on artifact 25770 with a dialog closed 50 ms after opening: before,
IsNuiFocused() was still true 600 ms later; after, it stays false.

[core]/esx_menu_dialog/client/main.lua

@@ -15,7 +15,9 @@ local function openMenu(namespace, name, data)
     })
 
     local timeoutId = ESX.SetTimeout(200, function()
-        SetNuiFocus(true, true)
+        if next(OpenedMenus) then
+            SetNuiFocus(true, true)
+        end
     end)
 
     table.insert(Timeouts, timeoutId)

[core]/esx_menu_list/client/main.lua

@@ -12,7 +12,9 @@ CreateThread(function()
             data = data,
         })
         SetTimeout(200, function()
-            SetNuiFocus(true, true)
+            if next(OpenedMenus) then
+                SetNuiFocus(true, true)
+            end
         end)
     end