Menu: Amend the previous commit

Kindle animations are Reader only ;).

frontend/ui/elements/page_turns.lua

@@ -1,3 +1,4 @@
+local Device = require("device")
 local Event = require("ui/event")
 local ReaderUI = require("apps/reader/readerui")
 local UIManager = require("ui/uimanager")
@@ -170,4 +171,17 @@ When enabled the UI direction for the Table of Contents, Book Map, and Page Brow
     }
 }
 
+if Device:canDoSwipeAnimation() then
+    table.insert(PageTurns.sub_item_table, {
+        text =_("Page turn animations"),
+        checked_func = function()
+            return G_reader_settings:isTrue("swipe_animations")
+        end,
+        callback = function()
+            UIManager:broadcastEvent(Event:new("TogglePageChangeAnimation"))
+        end,
+        separator = true,
+    })
+end
+
 return PageTurns

frontend/ui/elements/platform_navigation.lua

@@ -1,41 +1,28 @@
 local Device = require("device")
+
+-- Everything in there requires physicla page turn keys ;).
+if Device:hasKeys() then
+    -- No menu entry at all if we don't have any
+    return {}
+end
+
 local Event = require("ui/event")
 local UIManager = require("ui/uimanager")
 local _ = require("gettext")
 
 local PlatformNav = {
     text = _("Page turn behavior"), -- Mainly so as to differentiate w/ "Page Turns" when in readermenu...
-    sub_item_table = {},
+    sub_item_table = {
+        {
+            text = _("Invert page turn buttons"),
+            checked_func = function()
+                return G_reader_settings:isTrue("input_invert_page_turn_keys")
+            end,
+            callback = function()
+                UIManager:broadcastEvent(Event:new("SwapPageTurnButtons"))
+            end,
+        }
+    },
 }
 
-if Device:canDoSwipeAnimation() then
-    table.insert(PlatformNav.sub_item_table, {
-        text =_("Page turn animations"),
-        checked_func = function()
-            return G_reader_settings:isTrue("swipe_animations")
-        end,
-        callback = function()
-            UIManager:broadcastEvent(Event:new("TogglePageChangeAnimation"))
-        end,
-        separator = true,
-    })
-end
-
-if Device:hasKeys() then
-    table.insert(PlatformNav.sub_item_table, {
-        text = _("Invert page turn buttons"),
-        checked_func = function()
-            return G_reader_settings:isTrue("input_invert_page_turn_keys")
-        end,
-        callback = function()
-            UIManager:broadcastEvent(Event:new("SwapPageTurnButtons"))
-        end,
-    })
-end
-
--- No menu item at all if it's empty
-if #PlatformNav.sub_item_table == 0 then
-    return {}
-end
-
 return PlatformNav