Fix nav drawer item highlight being wrong after returning from an activity

When selecting an item that leads to an activity (Profile, Friends), that item was being highlighted. However, once returned from the activity the item would still be selected even thoughwrong. This commit solves the issue by not highlighting items that lead to activities at all.
Merge pull request #170 from xiprox/nav-drawer-highlight

Fix nav drawer item highlight being wrong after returning from an activity