Fix initial keypad layout regression in last commit
Fix initial keypad layout regression in last commit

Needed to test for isOnDisplay() in callsChanged slot,
not in the updateLayoutPolicy(), since the latter is called
on every appeared() signal triggered on the keypad overlay.

Signed-off-by: Shane Bryan <bb9fedbb0bee6c6c53f32da7fce5f936ef59aaaa@linux.intel.com>

lbt/meego-handset-dialer,lbt/meego-handset-dialer,lbt/meego-handset-dialer,lbt/meego-handset-dialer