优化：钱包表更换。

application/api/model/Sign.php

@@ -83,7 +83,7 @@ class Sign extends Model
      */
     public function sign_coin($user_id,$room_id,$sign_user_id,$sign_value,$sign_time){
         //查询用户金币
-        $user_coin = db::name('user_wallet')->where('user_id',$user_id)->value('coin');
+        $user_coin = db::name('user_wallet_coin')->where('user_id',$user_id)->value('coin');
         if($user_coin < $sign_value){
             return ['code' => 0, 'msg' => '金币不足','data' => null];
         }