feat: 优化代码

app/src/main/java/io/legado/app/model/WebBook.kt

@@ -84,8 +84,8 @@ class WebBook(val bookSource: BookSource) {
         scope: CoroutineScope = Coroutine.DEFAULT,
         context: CoroutineContext = Dispatchers.IO
     ): Coroutine<Book> {
-        book.type = bookSource.bookSourceType
         return Coroutine.async(scope, context) {
+            book.type = bookSource.bookSourceType
             val body =
                 if (!book.infoHtml.isNullOrEmpty()) {
                     book.infoHtml
@@ -111,8 +111,8 @@ class WebBook(val bookSource: BookSource) {
         scope: CoroutineScope = Coroutine.DEFAULT,
         context: CoroutineContext = Dispatchers.IO
     ): Coroutine<List<BookChapter>> {
-        book.type = bookSource.bookSourceType
         return Coroutine.async(scope, context) {
+            book.type = bookSource.bookSourceType
             val body =
                 if (book.bookUrl == book.tocUrl && !book.tocHtml.isNullOrEmpty()) {
                     book.tocHtml