shell: Fix passing maximized state from the start

We've added an optimization where we where sending to regular (desktop)
surfaces from the beginning the maximized state, together with the size
whenever the client signaled that it is ready to present.

That optimization failed to take into account other potential roles,
more importanly, the pop-op role which should not be getting any window
state, and implicitly shouldn't be getting any surface dimensions,
leaving it to the client to decide that. Patch checks all pending lists
to make sure we're not skipping any on purpose.

Bug-AGL: SPEC-4119

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I4f8c62af545c5955e7fa41c3fd73f52d6c73b600