Add missing rollingLinks option to revealjs template (#4778)

Fix (add) the missing option 'rollingLinks' in reveal.js template.

data/templates/default.revealjs

@@ -170,6 +170,10 @@ $if(mouseWheel)$
         // Enable slide navigation via mouse wheel
         mouseWheel: $mouseWheel$,
 $endif$
+$if(rollingLinks)$
+        // Apply a 3D roll to links on hover
+        rollingLinks: $rollingLinks$,
+$endif$
 $if(hideAddressBar)$
         // Hides the address bar on mobile devices
         hideAddressBar: $hideAddressBar$,