修复bug

app/src/main/java/io/legado/app/service/help/ReadAloud.kt

@@ -18,7 +18,6 @@ object ReadAloud {
     private fun getReadAloudClass(): Class<*> {
         val spId = App.INSTANCE.getPrefLong(PreferKey.speakEngine)
         httpTTS = App.db.httpTTSDao().get(spId)
-        stop(App.INSTANCE)
         return if (httpTTS != null) {
             HttpReadAloudService::class.java
         } else {
@@ -27,6 +26,7 @@ object ReadAloud {
     }
 
     fun upReadAloudClass() {
+        stop(App.INSTANCE)
         aloudClass = getReadAloudClass()
     }