Timeline: revert back the paginateBackwards in the TimelinePresenter so it's now blocked in the Timeline if needed

Author: ganfra

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelinePresenter.kt

@@ -85,6 +85,11 @@ class TimelinePresenter @Inject constructor(
             timeline
                 .timelineItems
                 .onEach(timelineItemsFactory::replaceWith)
+                .onEach { timelineItems ->
+                    if (timelineItems.isEmpty()) {
+                        paginateBackwards()
+                    }
+                }
                 .launchIn(this)
         }