fix no eink optimization on all devices

frontend/ui/elements/screen_eink_opt_menu_table.lua

@@ -1,9 +1,6 @@
 local _ = require("gettext")
 local Screen = require("device").screen
 
-local eink = G_reader_settings:readSetting("eink")
-Screen.eink = (eink == nil) and true or eink
-
 return {
     text = _("E-ink optimization"),
     checked_func = function() return Screen.eink end,

frontend/ui/screen.lua

@@ -1,2 +1,8 @@
 -- compatibility wrapper
-return require("device").screen
+local Screen = require("device").screen
+
+-- set eink flag for this screen
+local is_eink = G_reader_settings:readSetting("eink")
+Screen.eink = (is_eink == nil) and true or is_eink
+
+return Screen