[AF Wallet] Parametrize USSWalletMetadata for all single_client tests

As none of the other fixtures specifies the value for the
USSWalletMetadata feature flag, we can parametrize all these tests as
well.

Bug: 853688
Change-Id: I4083a485265bc25dc03cedfb56c36f2b4c1f5dc6
Reviewed-on: https://chromium-review.googlesource.com/c/1411597
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623146}
1 file changed