[KSystemActivityDialog] Fix loading default settings

The default settings are set when they are loading.

BUG: 454566


(cherry picked from commit 4fbb2953e7)

systemmonitor/ksystemactivitydialog.cpp

@@ -45,9 +45,7 @@ KSystemActivityDialog::KSystemActivityDialog(QWidget *parent)
     connect(closeAction, &QAction::triggered, this, &KSystemActivityDialog::close);
     addAction(closeAction);
 
-    if (m_configGroup.exists()) {
-        m_processList->loadSettings(m_configGroup);
-    }
+    m_processList->loadSettings(m_configGroup);
 
     QDBusConnection con = QDBusConnection::sessionBus();
     con.registerObject(QStringLiteral("/"), this, QDBusConnection::ExportAllSlots);