Update ash CreateTestWidget() callers to specify ownership.

We're refactoring Views to change the default ownership model
for Widgets to CLIENT_OWNS_WIDGET. As part of this we need
to ensure all the existing users are specifying the ownership
explicitly so that we can remove any default values (and then
potentially change to the new value as a default down the road).

This change updates all the callers in //ash to explicitly pass
the widget ownership model to AshTestBase::CreateTestWidget()

There should be no functional changes in this CL.

Bug: 339619005
Change-Id: I5adaece6c5780de7e014c1ed7e7e9da1af490da6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5602187
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/main@{#1311595}