Restore the original volume after running AudioManagerTest.

In general, tests should be free from side-effects. In particular for this
test case, changing volumes may affect the do-not-distrurb mode and hence
may affect the results of other test cases.

Bug: 69983534
Test: Manually check the volume after android.media.cts.AudioManagerTest.
Change-Id: I18cb0f1d083f49a71ae5c7c09204a11da89aad35
(cherry picked from commit 23313809ac4346e54989b2fb89aac7cc77d34eb9)
1 file changed