GUI: Always show pruning explanation to avoid checkbox jumping around

Author: luke-jr

src/qt/forms/intro.ui

@@ -223,7 +223,7 @@
    <item>
     <widget class="QLabel" name="lblExplanation3">
      <property name="text">
-      <string>If you have chosen to limit block chain storage (pruning), the historical data must still be downloaded and processed, but will be deleted afterward to keep your disk usage low.</string>
+      <string>If you choose to limit block chain storage (pruning), the historical data must still be downloaded and processed, but will be deleted afterward to keep your disk usage low.</string>
      </property>
      <property name="wordWrap">
       <bool>true</bool>

src/qt/intro.cpp

@@ -380,7 +380,6 @@ void Intro::UpdatePruneLabels(bool prune_checked)
         m_required_space_gb = m_prune_target_gb + m_chain_state_size_gb;
         storageRequiresMsg = tr("Approximately %1 GB of data will be stored in this directory.");
     }
-    ui->lblExplanation3->setVisible(prune_checked);
     ui->pruneGB->setEnabled(prune_checked);
     static constexpr uint64_t nPowTargetSpacing = 10 * 60;  // from chainparams, which we don't have at this stage
     static constexpr uint32_t expected_block_data_size = 2250000;  // includes undo data