Retain backstack views by default (#7621)

app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/BaseController.kt

@@ -23,6 +23,8 @@ abstract class BaseController<VB : ViewBinding>(bundle: Bundle? = null) : Contro
     lateinit var viewScope: CoroutineScope
 
     init {
+        retainViewMode = RetainViewMode.RETAIN_DETACH
+
         addLifecycleListener(
             object : LifecycleListener() {
                 override fun postCreateView(controller: Controller, view: View) {

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt

@@ -40,10 +40,6 @@ class LibraryController(
      */
     private var settingsSheet: LibrarySettingsSheet? = null
 
-    init {
-        retainViewMode = RetainViewMode.RETAIN_DETACH
-    }
-
     override fun createPresenter(): LibraryPresenter = LibraryPresenter()
 
     @Composable