优化目录界面

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

@@ -83,6 +83,7 @@ class TocActivity : VMBaseActivity<ActivityChapterListBinding, TocViewModel>() {
     override fun onCompatOptionsItemSelected(item: MenuItem): Boolean {
         when (item.itemId) {
             R.id.menu_reverse_toc -> viewModel.reverseToc {
+                viewModel.chapterListCallBack?.clearDisplayTitle()
                 viewModel.chapterListCallBack?.upChapterList(searchView?.query?.toString())
                 setResult(RESULT_OK, Intent().apply {
                     putExtra("index", it.durChapterIndex)