Make color tinting less offensive

-don't tint colors when opening QuickContacts in its
 semi-collapsed state. Ie, the state it starts in when
 opened from Dialer
-the transition from untinted to solid color is quick
-always apply the black gradients to QuickContacts. Using
 less tinting makes the absence of gradients a bigger
 problem. We could have tweaked WhitenessUtils to apply
 the gradient in all problematic cases. But this turns
 out to be the majority of cases. So we should just
 apply the gradient all the time.
-made the gradient more attractive

Bug: 17944406
Change-Id: I46c8a7a3fccc0f7a7e8bb7470dee621edf92b8cb