Account for lack of prev/next options if only one page of levels

Otherwise the seventh and eighth levels would be grouped with the return
menu button.

Fixes #826.

desktop_version/src/Graphics.cpp

@@ -1595,7 +1595,16 @@ void Graphics::drawmenu( int cr, int cg, int cb, bool levelmenu /*= false*/ )
 
         if (levelmenu)
         {
-            if (game.menuoptions.size() - i <= 3)
+            size_t separator;
+            if (ed.ListOfMetaData.size() > 8)
+            {
+                separator = 3;
+            }
+            else
+            {
+                separator = 1;
+            }
+            if (game.menuoptions.size() - i <= separator)
             {
                 // We're on "next page", "previous page", or "return to menu". Draw them separated by a bit
                 y += 8;