优化

app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt

@@ -69,6 +69,9 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
                 }
             PreferKey.cleanCache -> {
                 BookHelp.clearCache()
+                requireActivity().cacheDir.listFiles()?.forEach {
+                    it.delete()
+                }
                 toast(R.string.clear_cache_success)
             }
         }