fix auto start

src/main/scala/com/github/shadowsocks/ShadowsocksReceiver.scala

@@ -66,6 +66,7 @@ class ShadowsocksReceiver extends BroadcastReceiver {
     if (isAutoConnect && isInstalled) {
       val intent = new Intent(context, classOf[ShadowsocksRunnerActivity])
       intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
       context.startActivity(intent)
     }
   }

src/main/scala/com/github/shadowsocks/ShadowsocksRunnerActivity.scala

@@ -67,6 +67,7 @@ class ShadowsocksRunnerActivity extends Activity {
         }
       } else {
         bgService.start(ConfigUtils.load(settings))
+        finish()
       }
     }
     override def onServiceDisconnected(name: ComponentName) {