JvmtiHostTest: Unset hidden_api_policy in finally block

If a JvmtiHostTest fails, it will leave hidden_api_policy property
set to 1. This may cause other tests to fail when they shouldn't
(StrictModeTest expects checks enabled) or not fail when there is
a genuine problem (setting to 1 disables checks).

Test: atest CtsJvmtiRunTest931HostTestCases
Change-Id: Ia793b3fccfc9433c3e110455b765ebc8934976de
1 file changed