Qt: Clear help text map on reload

Saves keeping messages around for pointers that are no longer valid.

src/duckstation-qt/settingswindow.cpp

@@ -183,6 +183,10 @@ void SettingsWindow::addPages()
           &GraphicsSettingsWidget::onShowDebugSettingsChanged);
 
   SettingWidgetBinder::BindWidgetToBoolSetting(m_sif.get(), m_ui.safeMode, "Main", "DisableAllEnhancements", false);
+
+  registerWidgetHelp(m_ui.safeMode, tr("Safe Mode"), tr("Unchecked"),
+                     tr("Disables all enhancement options, simulating the system as accurately as possible. Use to "
+                        "quickly determine whether an enhancement is responsible for game bugs."));
 }
 
 void SettingsWindow::reloadPages()
@@ -205,6 +209,8 @@ void SettingsWindow::reloadPages()
     m_ui.safeMode->disconnect();
   }
 
+  m_widget_help_text_map.clear();
+  m_current_help_widget = nullptr;
   addPages();
 }
 
@@ -238,10 +244,6 @@ void SettingsWindow::connectUi()
     connect(m_ui.copyGlobalSettings, &QPushButton::clicked, this, &SettingsWindow::onCopyGlobalSettingsClicked);
   if (m_ui.clearGameSettings)
     connect(m_ui.clearGameSettings, &QPushButton::clicked, this, &SettingsWindow::onClearSettingsClicked);
-
-  registerWidgetHelp(m_ui.safeMode, tr("Safe Mode"), tr("Unchecked"),
-                     tr("Disables all enhancement options, simulating the system as accurately as possible. Use to "
-                        "quickly determine whether an enhancement is responsible for game bugs."));
 }
 
 void SettingsWindow::addWidget(QWidget* widget, QString title, QString icon, QString help_text)