Use overridden default xml for TwoPanelWorkspaceTest

- Partially reverted TAPL and TwoPanelWorkspaceTest changes on http://ag/19195512

Fix: 262627208
Fix: 262632384
Test: TwoPanelWorkspaceTest
Change-Id: I8b793bfb3874cc6305ce8b0f9f7b0a116d01222b
8 files changed