Initialize wxRibbonBar::m_help_button_hovered.

This variable was never initialized, do it now.

See #14868.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73161 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/ribbon/bar.cpp

@@ -712,6 +712,7 @@ wxRibbonBar::wxRibbonBar()
     m_tab_scroll_right_button_state = wxRIBBON_SCROLL_BTN_NORMAL;
     m_tab_scroll_buttons_shown = false;
     m_arePanelsShown = true;
+    m_help_button_hovered = false;
 }
 
 wxRibbonBar::wxRibbonBar(wxWindow* parent,