Move clear history from advanced settings to history screen menu (closes #4613)

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAdvancedController.kt

@@ -110,16 +110,6 @@ class SettingsAdvancedController : SettingsController() {
                     ctrl.showDialog(router)
                 }
             }
-            preference {
-                titleRes = R.string.pref_clear_history
-                summaryRes = R.string.pref_clear_history_summary
-
-                onClick {
-                    val ctrl = ClearHistoryDialogController()
-                    ctrl.targetController = this@SettingsAdvancedController
-                    ctrl.showDialog(router)
-                }
-            }
         }
 
         preferenceCategory {
@@ -197,22 +187,6 @@ class SettingsAdvancedController : SettingsController() {
         }
     }
 
-    class ClearHistoryDialogController : DialogController() {
-        override fun onCreateDialog(savedViewState: Bundle?): Dialog {
-            return MaterialDialog(activity!!)
-                .message(R.string.clear_history_confirmation)
-                .positiveButton(android.R.string.ok) {
-                    (targetController as? SettingsAdvancedController)?.clearHistory()
-                }
-                .negativeButton(android.R.string.cancel)
-        }
-    }
-
-    private fun clearHistory() {
-        db.deleteHistory().executeAsBlocking()
-        activity?.toast(R.string.clear_history_completed)
-    }
-
     private fun clearDatabase() {
         db.deleteMangasNotInLibrary().executeAsBlocking()
         db.deleteHistoryNoLastRead().executeAsBlocking()