[FIX] web: set cursor pointer on link hovering in nocontent help

While displaying no content help, hovering over link was not displaying cursor
as a pointer type.

This bug has been introduced with the new design on nocontent helpers.

addons/web/static/src/less/views.less

@@ -60,6 +60,10 @@
             font-size: 125%;
         }
 
+        a {
+            cursor: pointer;
+        }
+
         .o-init-image() {
             content: "";
             display: block;