MicrodroidDeviceTestBase: Fix logging runInShellWithStderr am: 35c4c55f47

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/3543343

Change-Id: If8f987c9a142b7b559e60b9527421de455247d9b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>