Don't preserve the window on client side when pinning activity.

We were both enabling window replacement in WMS and window preserving on
the client side. This doesn't work together, because window replacement
depends on the fact that the client won't preserve the window (it needs
to receive remove and add window operations).

Bug: 25854235
Change-Id: I0625df6fbe4c29bf14f364d764de3bf63dc90961