[plasmalnf] Expand explanation, drop CSS

src/modules/plasmalnf/PlasmaLnfPage.cpp

@@ -61,7 +61,7 @@ PlasmaLnfPage::PlasmaLnfPage( QWidget* parent )
     CALAMARES_RETRANSLATE(
     {
         ui->retranslateUi( this );
-        ui->generalExplanation->setText( tr( "Please choose a look-and-feel for the KDE Plasma Desktop, below." ) );
+        ui->generalExplanation->setText( tr( "Please choose a look-and-feel for the KDE Plasma Desktop. You can also skip this step and configure the look-and-feel once the system is installed." ) );
         updateThemeNames();
         fillUi();
     }

src/modules/plasmalnf/page_plasmalnf.ui

@@ -16,10 +16,6 @@
   <layout class="QVBoxLayout" name="verticalLayout" stretch="0,0">
    <item>
     <widget class="QLabel" name="generalExplanation">
-     <property name="styleSheet">
-      <string notr="true">margin-bottom: 1ex;
-margin-left: 2em;</string>
-     </property>
      <property name="text">
       <string>Placeholder</string>
      </property>