CRAS: system_state - fix unit test
CRAS: system_state - fix unit test

Unit test was broken by recent change of default capture gain.

BUG=none.
TEST=This is a test, run it.

Change-Id: Id1f43e1e8da96cb33568a51110fb97f5fc5ca743
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>

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