Check for new versions even if we think one is available

* This way if someone updates their install without clicking the menu item
  to clear this flag, it will still detect the update after a few days.
* (And when I forget to update which beta is latest, it will fix itself
  eventually. Oops).

renderdocui/Windows/MainWindow.cs

@@ -902,12 +902,6 @@ namespace renderdocui.Windows
             if(!OfficialVersion && !BetaVersion)
                 return;
 
-            if (m_Core.Config.CheckUpdate_UpdateAvailable)
-            {
-                SetUpdateAvailable();
-                return;
-            }
-
             DateTime today = DateTime.Now;
             DateTime compare = today.AddDays(-2);