applets/clipboard: reject up key event when search field has focus

Return the event to KeyNavigation in the future.

applets/clipboard/contents/ui/ClipboardPage.qml

@@ -182,6 +182,9 @@ Menu {
                 clipboardMenu.view.currentIndex = -1;
                 filter.forceActiveFocus();
                 filter.selectAll();
+            } else if (filter.activeFocus) {
+                event.accepted = false;
+                return;
             } else {
                 clipboardMenu.view.decrementCurrentIndex();
                 goToCurrent();