Fix reader desktop page selection in double page mode

For the double page mode the secondary page index gets used.
This was changed with 9a8655db2f, however, this occurrence was overlooked

src/modules/reader/components/overlay/navigation/desktop/ReaderNavBarDesktopPageNavigation.tsx

@@ -53,9 +53,9 @@ export const ReaderNavBarDesktopPageNavigation = ({
                     value={getNextIndexFromPage(currentPage)}
                     onChange={(e) => openPage(e.target.value as number)}
                 >
-                    {pages.map(({ primary: { index }, name }) => (
-                        <MenuItem key={index} value={index}>
-                            {name}
+                    {pages.map((page) => (
+                        <MenuItem key={getNextIndexFromPage(page)} value={getNextIndexFromPage(page)}>
+                            {page.name}
                         </MenuItem>
                     ))}
                 </Select>