Update label for X button next to Recent searches from “close” to “clear”

Mastodon/Scene/Search/SearchDetail/SearchHistory/Cell/SearchHistorySectionHeaderCollectionReusableView.swift

@@ -33,6 +33,8 @@ final class SearchHistorySectionHeaderCollectionReusableView: UICollectionReusab
         let button = UIButton(type: .system)
         button.setImage(UIImage(systemName: "xmark.circle.fill"), for: .normal)
         button.tintColor = Asset.Colors.Label.secondary.color
+        button.accessibilityLabel = L10n.Scene.Search.Searching.clear
+
         return button
     }()