Fix #1200826 [Matching a library book to device search default](https://bugs.launchpad.net/calibre/+bug/1200826) (patch taken from cbhaley)

src/calibre/gui2/dialogs/match_books.py

@@ -107,6 +107,8 @@ def __init__(self, gui, view, id_):
         self.buttonBox.rejected.connect(self.reject)
         self.ignore_next_key = False
 
+        self.search_text.setText(self.device_db[self.current_device_book_id].title)
+
     def return_pressed(self):
         self.ignore_next_key = True
         self.do_search()