Use PasteButton on iOS 16

OTP/Views/EditKeyForm.swift

@@ -41,6 +41,15 @@ struct EditKeyForm: View {
             
             HStack {
                 TextField("Secret", text: $editedKey.secret)
+                if #available(iOS 16.0, *) {
+                    PasteButton(payloadType: String.self) { pasted in
+                        if let s = pasted.first {
+                            self.editedKey.secret = s
+                        }
+                    }
+                    .labelStyle(.iconOnly)
+                    .buttonBorderShape(.capsule)
+                } else {
                     Button {
                         self.editedKey.secret = UIPasteboard.general.string ?? ""
                     } label: {
@@ -51,6 +60,7 @@ struct EditKeyForm: View {
                     .buttonStyle(.plain)
                     .disabled(!UIPasteboard.general.hasStrings)
                 }
+            }
             
             HStack {
                 Text("Period")