secure_element: Fix the expectation for closeChannel in VTS tests

The AIDL interface states that closeChannel must return FAILED
if the channel is not opened. The default AIDL implementation
did not respect this requirement either.

Bug: 266384111
Test: m VtsHalSecureElementTargetTest
Change-Id: I3e7142e6bbeb9d79cea2c109689da59c0615167a