Update app.py

app.py

@@ -96,7 +96,7 @@ class KanaQuizApp:
         next_args = gr_args(self.next_char, next_inputs, next_outputs)
 
         select_outputs = [self.chk_kana, self.chk_seion, self.chk_dakuon]
-        select_outputs = [self.chk_handakuon, self.chk_youon]
+        select_outputs += [self.chk_handakuon, self.chk_youon]
         select_all_args = gr_args(self.select_all, outputs=select_outputs)
 
         select_none_args = gr_args(self.select_none, outputs=select_outputs)