applets/clipboard: press Ctrl+S to save in the edit page

(cherry picked from commit c0195f16ad)

applets/clipboard/contents/ui/EditPage.qml

@@ -4,7 +4,7 @@
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
-import QtQuick 2.0
+import QtQuick 2.15
 import QtQuick.Controls 2.15 as QQC2 // For StackView
 import QtQuick.Layouts 1.1
 import org.kde.plasma.core 2.0 as PlasmaCore
@@ -44,6 +44,11 @@ ColumnLayout {
         }
     }
 
+    Shortcut {
+        sequence: StandardKey.Save
+        onActivated: saveAndExit()
+    }
+
     PlasmaComponents3.ScrollView {
         Layout.fillWidth: true
         Layout.fillHeight: true