Revert "[kcms/activities] Use correct method to set active global shortcut"

This reverts commit c5413826.

kcms/activities/imports/dialog.cpp

@@ -290,7 +290,8 @@ void Dialog::saveChanges(const QString &activityId)
     action.setProperty("isConfigurationAction", true);
     action.setProperty("componentName", QStringLiteral("ActivityManager"));
     action.setObjectName(QStringLiteral("switch-to-activity-") + activityId);
-    KGlobalAccel::self()->setShortcut(&action, {activityShortcut()}, KGlobalAccel::NoAutoloading);
+    KGlobalAccel::self()->removeAllShortcuts(&action);
+    KGlobalAccel::self()->setGlobalShortcut(&action, activityShortcut());
 
     // is private?
     d->features->SetValue(QStringLiteral("org.kde.ActivityManager.Resources.Scoring/isOTR/")