WiFi: Add forget all networks

Change-Id: Id4e0bf76743dadf62a23e070e6421dd1549df29c
Wrong referring to the resource - id/android:id

We were referring to the resource defined as
@+android:id with R.id. which is wrong. This
fix changes the @+android:id/ to @+id/

Change-Id: Ifdca7347bff31311c9c07aecdb110946e4a239ed