fix back after scrolling

src/ltui/choicebox.lua

@@ -51,6 +51,9 @@ function choicebox:load(values, selected)
     -- clear the views first
     self:clear()
 
+    -- reset start index
+    self._STARTINDEX = 1
+
     -- load items
     local items = {}
     for idx, value in ipairs(values) do

src/ltui/menuconf.lua

@@ -54,6 +54,9 @@ function menuconf:load(configs)
     -- clear the views first
     self:clear()
 
+    -- reset start index
+    self._STARTINDEX = 1
+
     -- detach the previous config and view
     local configs_prev = self._CONFIGS._PREV
     if configs_prev then