[netinstall] Simplify slots in the UI page

src/modules/netinstall/NetInstallPage.cpp

@@ -33,8 +33,12 @@ NetInstallPage::NetInstallPage( Config* c, QWidget* parent )
     ui->setupUi( this );
     ui->groupswidget->header()->setSectionResizeMode( QHeaderView::ResizeToContents );
     ui->groupswidget->setModel( c->model() );
-    connect( c, &Config::statusChanged, this, &NetInstallPage::setStatus );
-    connect( c, &Config::titleLabelChanged, this, &NetInstallPage::setTitle );
+    connect( c, &Config::statusChanged, ui->netinst_status, &QLabel::setText );
+    connect( c, &Config::titleLabelChanged, [ui = this->ui]( const QString title ) {
+        ui->label->setVisible( !title.isEmpty() );
+        ui->label->setText( title );
+    } );
+
     connect( c, &Config::statusReady, this, &NetInstallPage::expandGroups );
 }
 
@@ -55,26 +59,6 @@ NetInstallPage::expandGroups()
     }
 }
 
-void
-NetInstallPage::setStatus( QString s )
-{
-    ui->netinst_status->setText( s );
-}
-
-void
-NetInstallPage::setTitle( QString title )
-{
-    if ( title.isEmpty() )
-    {
-        ui->label->hide();
-    }
-    else
-    {
-        ui->label->setText( title );  // That's get() on the TranslatedString
-        ui->label->show();
-    }
-}
-
 void
 NetInstallPage::onActivate()
 {

src/modules/netinstall/NetInstallPage.h

@@ -39,10 +39,6 @@ public:
 
     void onActivate();
 
-public slots:
-    void setStatus( QString s );
-    void setTitle( QString title );
-
     /** @brief Expand entries that should be pre-expanded.
      *
      * Follows the *expanded* key / the startExpanded field in the