[netinstall] Remove data-indirection

- There is no need to move data around between two parts of the
   same module via global storage.

src/modules/netinstall/NetInstallPage.cpp

@@ -24,8 +24,8 @@
 #include "PackageModel.h"
 
 #include "ui_page_netinst.h"
-#include "GlobalStorage.h"
 #include "JobQueue.h"
+
 #include "utils/Logger.h"
 #include "utils/Retranslator.h"
 #include "utils/YamlUtils.h"
@@ -128,12 +128,8 @@ NetInstallPage::selectedPackages() const
 }
 
 void
-NetInstallPage::loadGroupList()
+NetInstallPage::loadGroupList( const QString& confUrl )
 {
-    QString confUrl(
-        Calamares::JobQueue::instance()->globalStorage()->value(
-            "groupsUrl" ).toString() );
-
     QNetworkRequest request;
     request.setUrl( QUrl( confUrl ) );
     // Follows all redirects except unsafe ones (https to http).

src/modules/netinstall/NetInstallPage.h

@@ -25,13 +25,14 @@
 #include "PackageTreeItem.h"
 #include "Typedefs.h"
 
-#include <QWidget>
 #include <QAbstractButton>
 #include <QNetworkAccessManager>
+#include <QWidget>
 
 // required forward declarations
 class QByteArray;
 class QNetworkReply;
+class QString;
 
 namespace Ui
 {
@@ -46,10 +47,12 @@ public:
 
     void onActivate();
 
-    // Retrieves the groups, with name, description and packages, from
-    // the remote URL configured in the settings. Assumes the URL is already
-    // in the global storage. This should be called before displaying the page.
-    void loadGroupList();
+    /** @brief Retrieves the groups, with name, description and packages
+     *
+     * Loads data from the given URL. This should be called before
+     * displaying the page.
+     */
+    void loadGroupList( const QString& url );
 
     // Sets the "required" state of netinstall data. Influences whether
     // corrupt or unavailable data causes checkReady() to be emitted

src/modules/netinstall/NetInstallViewStep.cpp

@@ -186,8 +186,10 @@ NetInstallViewStep::setConfigurationMap( const QVariantMap& configurationMap )
     QString groupsUrl = CalamaresUtils::getString( configurationMap, "groupsUrl" );
     if ( !groupsUrl.isEmpty() )
     {
+        // Keep putting groupsUrl into the global storage,
+        // even though it's no longer used for in-module data-passing.
         Calamares::JobQueue::instance()->globalStorage()->insert( "groupsUrl", groupsUrl );
-        m_widget->loadGroupList();
+        m_widget->loadGroupList( groupsUrl );
     }
 }