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GetTerminalId returns old terminal, or Terminal System
App if feature is on.

Launches System App when LaunchCrostiniApp is called with
Terminal System App ID.

Bug: 1019021
Change-Id: I2420e2f3ca5bcc423ee5ea991f4301b86d1b965d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1925831Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716946}