[welcome] Move languageIcon loading into the Config object

- The QML module had an additional check that the normal one
  did not; add it in the merged code.

src/modules/welcome/Config.cpp

@@ -22,6 +22,7 @@
 #include "Settings.h"
 #include "utils/Logger.h"
 #include "utils/Retranslator.h"
+#include "utils/Variant.h"
 
 Config::Config( QObject* parent )
     : QObject( parent )
@@ -289,4 +290,14 @@ Config::setConfigurationMap( const QVariantMap& configurationMap )
     setReleaseNotesUrl(
         jobOrBrandingSetting( Branding::ReleaseNotesUrl, configurationMap, "showReleaseNotesUrl" ) );
     setDonateUrl( jobOrBrandingSetting( Branding::DonateUrl, configurationMap, "showDonateUrl" ) );
+
+    QString language = CalamaresUtils::getString( configurationMap, "languageIcon" );
+    if ( !language.isEmpty() )
+    {
+        auto icon = Calamares::Branding::instance()->image( language, QSize( 48, 48 ) );
+        if ( !icon.isNull() )
+        {
+            setLanguageIcon( language );
+        }
+    }
 }

src/modules/welcome/WelcomeViewStep.cpp

@@ -151,12 +151,6 @@ WelcomeViewStep::setConfigurationMap( const QVariantMap& configurationMap )
         }
     }
 
-    QString language = CalamaresUtils::getString( configurationMap, "languageIcon" );
-    if ( !language.isEmpty() )
-    {
-        m_conf->setLanguageIcon( language );
-    }
-
     //here init the qml or qwidgets needed bits
     m_widget->init();
 }

src/modules/welcomeq/WelcomeQmlViewStep.cpp

@@ -144,16 +144,6 @@ WelcomeQmlViewStep::setConfigurationMap( const QVariantMap& configurationMap )
 		}
 	}
 
-	QString language = CalamaresUtils::getString( configurationMap, "languageIcon" );
-	if ( !language.isEmpty() )
-	{
-		auto icon = Calamares::Branding::instance()->image( language, QSize( 48, 48 ) );
-		if ( !icon.isNull() )
-		{
-			m_config->setLanguageIcon(language);
-		}
-	}
-
     Calamares::QmlViewStep::setConfigurationMap( configurationMap ); // call parent implementation last
     setContextProperty( "Welcome", m_config );
 }