Fixed NavBar causing SystemUI FC's

Modified to remove FC's experienced when changing NavBar targets, not always immediate I didn't have a problem until my screen turned off. Once I woke up the device I received constant SystemUI FC's. This commit resolves that issue. This has been an issue constantly reported in the i9100 PACman thread on xda. Compiled and tested with no issues, I have been able to change NavBar buttons to anything and have not received a FC now at all.

Change-Id: I007b1e8e8fa9efb751d4238bdd1065f2735e57d5