[partition] Chase deprecations in Qt

src/modules/partition/gui/PartitionLabelsView.cpp

@@ -276,7 +276,7 @@ PartitionLabelsView::drawLabels( QPainter* painter,
             labelRect.adjust( 0, -LAYOUT_MARGIN, 0, -2*LAYOUT_MARGIN );
             painter->translate( 0.5, 0.5 );
             QRect hoverRect = labelRect.adjusted( 0, 0, -1, -1 );
-            painter->setBrush( QPalette().background().color().lighter( 102 ) );
+            painter->setBrush( QPalette().window().color().lighter( 102 ) );
             painter->setPen( Qt::NoPen );
             painter->drawRoundedRect( hoverRect, CORNER_RADIUS, CORNER_RADIUS );
 

src/modules/partition/gui/PartitionViewStep.cpp

@@ -277,7 +277,7 @@ PartitionViewStep::createSummaryWidget() const
         jobsLabel->setText( jobsLines.join( "<br/>" ) );
         jobsLabel->setMargin( CalamaresUtils::defaultFontHeight() / 2 );
         QPalette pal;
-        pal.setColor( QPalette::Background, pal.background().color().lighter( 108 ) );
+        pal.setColor( QPalette::Background, pal.window().color().lighter( 108 ) );
         jobsLabel->setAutoFillBackground( true );
         jobsLabel->setPalette( pal );
     }