Dump the last Activity information when dumpsys translation

When bugreport dumps Activity information, it will dump translation
related information. But it adds -v parameter, the bugreport will
only dump visible task's top Activity. If message apps go to the
background, we cannot find our expected information. We try to let
translation dumpsys to dump the last Activity information if the
Activity isn't destroyed yet, e.g. go to background.

Bug: 187889345
Test: open chat app and back home then dumpsys translation. Let
Activity destroyed and make sure no Activity dump.

Change-Id: Ie5b935696a74ca3f298c5e6e5994fa659389e198