Add banner for Incognito Mode

app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt

@@ -169,6 +169,10 @@ class MainActivity : BaseActivity<MainActivityBinding>() {
         preferences.downloadedOnly()
             .asImmediateFlow { binding.downloadedOnly.isVisible = it }
             .launchIn(scope)
+
+        preferences.incognitoMode()
+            .asImmediateFlow { binding.incognitoMode.isVisible = it }
+            .launchIn(scope)
     }
 
     override fun onNewIntent(intent: Intent) {

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt

@@ -409,7 +409,7 @@ class ReaderPresenter(
      * Saves this [chapter] last read history.
      */
     private fun saveChapterHistory(chapter: ReaderChapter) {
-        if (!preferences.incognitoMode()) {
+        if (!preferences.incognitoMode().get()) {
             val history = History.create(chapter.chapter).apply { last_read = Date().time }
             db.updateHistoryLastRead(history).asRxCompletable()
                 .onErrorComplete()