Resolves tdf#166974 - Invert ShowAgain logic on WhatsNew dialog

Follow-up to ca4328f998

Change-Id: Iaca96b78677695e59144cc7125a4f3283741e580
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/204744
Reviewed-by: Heiko Tietze <heiko.tietze@documentfoundation.org>
Tested-by: Jenkins

cui/source/dialogs/welcomedlg.cxx

@@ -67,7 +67,7 @@ WelcomeDialog::WelcomeDialog(weld::Window* pParent, const bool bIsFirstStart)
 void WelcomeDialog::ImplDestroy()
 {
     m_xTabCtrl->set_current_page(sNewsTab); // ensure next start with the first page
-    if (!m_xShowAgain->get_active())
+    if (m_xShowAgain->get_active())
     {
         std::shared_ptr<comphelper::ConfigurationChanges> xChanges(
             comphelper::ConfigurationChanges::create());

cui/uiconfig/ui/welcomedialog.ui

@@ -23,12 +23,11 @@
             <property name="layout-style">end</property>
             <child>
               <object class="GtkCheckButton" id="cbShowAgain">
-                <property name="label" translatable="yes" context="welcomedialog|showagain">Do Show Again</property>
+                <property name="label" translatable="yes" context="welcomedialog|showagain">Do not show again</property>
                 <property name="visible">True</property>
                 <property name="can-focus">True</property>
                 <property name="receives-default">False</property>
                 <property name="use-underline">True</property>
-                <property name="active">True</property>
                 <property name="draw-indicator">True</property>
               </object>
               <packing>