Incorrect identifier in contextual_preprocess_user_profile()

Inside of contextual_preprocess_user_profile(), there is a bug in the code.

It was:

    contextual_set_closure($links, 'contextual-node-'. $vars['user']->uid);

It should be:

    contextual_set_closure($links, 'contextual-user-'. $vars['user']->uid);

(btw, active development in master is really confusing; most modules are not using master and developing in named branches).