Add presenter subscriptions to the subscription list when using custom subscribe methods

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaPresenter.kt

@@ -49,8 +49,8 @@ class MangaPresenter : BasePresenter<MangaActivity>() {
         // Prepare a subject to communicate the chapters and info presenters for the chapter count.
         SharedData.put(ChapterCountEvent())
 
-        add(Observable.just(manga)
-                .subscribeLatestCache({ view, manga -> view.onSetManga(manga) }))
+        Observable.just(manga)
+                .subscribeLatestCache({ view, manga -> view.onSetManga(manga) })
     }
 
     override fun onDestroy() {

app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/ChaptersPresenter.kt

@@ -69,8 +69,8 @@ class ChaptersPresenter : BasePresenter<ChaptersFragment>() {
                 { view, error -> Timber.e(error.cause, error.message) })
 
         manga = SharedData.get(MangaEvent::class.java)?.manga ?: return
-        add(Observable.just(manga)
-                .subscribeLatestCache({ view, manga -> view.onNextManga(manga) }))
+        Observable.just(manga)
+                .subscribeLatestCache({ view, manga -> view.onNextManga(manga) })
 
         source = sourceManager.get(manga.source)!!
         start(DB_CHAPTERS)

app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoPresenter.kt

@@ -79,9 +79,9 @@ class MangaInfoPresenter : BasePresenter<MangaInfoFragment>() {
 
         // Update chapter count
         SharedData.get(ChapterCountEvent::class.java)?.let {
-            add(it.observable
+            it.observable
                     .observeOn(AndroidSchedulers.mainThread())
-                    .subscribeLatestCache({ view, count -> view.setChapterCount(count) }))
+                    .subscribeLatestCache({ view, count -> view.setChapterCount(count) })
         }
     }