remove unused onPageUpdate and onPosUpdate in readertoc

frontend/ui/reader/readertoc.lua

@@ -1,7 +1,5 @@
 ReaderToc = InputContainer:new{
 	toc_menu_title = "Table of contents",
-	current_page = 0,
-	current_pos = 0,
 }
 
 function ReaderToc:init()
@@ -87,14 +85,6 @@ function ReaderToc:onShowToc()
 	UIManager:show(menu_container)
 end
 
-function ReaderToc:onPageUpdate(new_page_no)
-	self.current_page = new_page_no
-end
-
-function ReaderToc:onPosUpdate(new_pos)
-	self.current_pos = new_pos
-end
-
 function ReaderToc:addToMainMenu(item_table)
 	-- insert table to main reader menu
 	table.insert(item_table, {