优化

app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleViewModel.kt

@@ -15,9 +15,6 @@ class TxtTocRuleViewModel(app: Application) : BaseViewModel(app) {
 
     fun save(txtTocRule: TxtTocRule) {
         execute {
-            if (txtTocRule.serialNumber < 0) {
-                txtTocRule.serialNumber = appDb.txtTocRuleDao.maxOrder + 1
-            }
             appDb.txtTocRuleDao.insert(txtTocRule)
         }
     }