only strip punctuations when highlight to search

This should fix #1419.

frontend/apps/reader/modules/readerhighlight.lua

@@ -468,7 +468,8 @@ function ReaderHighlight:onHighlightSearch()
     DEBUG("search highlight")
     self:highlightFromHoldPos()
     if self.selected_text then
-        self.ui:handleEvent(Event:new("ShowSearchDialog", self.selected_text.text))
+        local text = require("util").stripePunctuations(self.selected_text.text)
+        self.ui:handleEvent(Event:new("ShowSearchDialog", text))
     end
 end
 

frontend/apps/reader/modules/readersearch.lua

@@ -29,7 +29,6 @@ function ReaderSearch:addToMainMenu(tab_item_table)
 end
 
 function ReaderSearch:onShowSearchDialog(text)
-    text = require("util").stripePunctuations(text)
     local do_search = function(search_func, text, param)
         return function()
             local res = search_func(self, text, param)