[Sync] Enable TwoClientDictionarySyncTest.Limit on win dbg + asan

Many fixes have landed since this test was disabled. It's therefore
worth giving it a try and enable it again.

Bug: 889505
Change-Id: Iedf8ae64a002ea508f8304c67248c68d5e88cd51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572339
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#651783}