Register both old and new post card cells

Updates the table view to register both the new and old post card
cells. This is done so that people switching the feature flag on/off
do not hit a crash.

WordPress/Classes/ViewRelated/Reader/ReaderTableConfiguration.swift

@@ -32,12 +32,11 @@ final class ReaderTableConfiguration {
     }
 
     private func setUpCardCell(_ tableView: UITableView) {
-        if FeatureFlag.readerImprovements.enabled {
-            tableView.register(ReaderPostCardCell.self, forCellReuseIdentifier: readerCardCellReuseIdentifier)
-        } else {
-            let nib = UINib(nibName: readerCardCellNibName, bundle: nil)
-            tableView.register(nib, forCellReuseIdentifier: oldReaderCardCellReuseIdentifier)
-        }
+        tableView.register(ReaderPostCardCell.self, forCellReuseIdentifier: readerCardCellReuseIdentifier)
+
+        // TODO: Delete when we remove the Reader Improvements v1 (`readerImprovements`) feature flag
+        let nib = UINib(nibName: readerCardCellNibName, bundle: nil)
+        tableView.register(nib, forCellReuseIdentifier: oldReaderCardCellReuseIdentifier)
     }
 
     private func setUpBlockerCell(_ tableView: UITableView) {