修复分组bug

app/src/main/java/io/legado/app/data/dao/BookDao.kt

@@ -24,10 +24,10 @@ interface BookDao {
     @Query("SELECT * FROM books WHERE (`group` & :group) > 0")
     fun observeByGroup(group: Long): LiveData<List<Book>>
 
-    @Query("select * from books where (SELECT sum(groupId) FROM book_groups) & `group` = 0")
+    @Query("select * from books where (SELECT sum(groupId) FROM book_groups where groupId > 0) & `group` = 0")
     fun observeNoGroup(): LiveData<List<Book>>
 
-    @Query("select count(bookUrl) from books where (SELECT sum(groupId) FROM book_groups) & `group` = 0")
+    @Query("select count(bookUrl) from books where (SELECT sum(groupId) FROM book_groups where groupId > 0) & `group` = 0")
     fun observeNoGroupSize(): LiveData<Int>
 
     @Query("SELECT * FROM books WHERE name like '%'||:key||'%' or author like '%'||:key||'%'")