Fix issue where transport control shows up off-screen on tablets

This fix selects the current page ealier in the reconstruction
of Keyguard to ensure the layout bounds of KeyguardWidgetPager are
correct by the time it does the initial layout.

In addition this change postpones selecting the transport page if
the transport was just added.

Fixes bug 11287144

Change-Id: I92ba8bb5e13c166d13fbaa26881f5034d5ab2104