Switch to "quiet" screenshot success when window destroyed

Currently, if the screenshot UI is dismissed before the screenshot
finishes saving, we'll get a spurious "SCREENSHOT_INTERACTION_TIMEOUT"
log. This is because the screenshot saving triggers
"showUiOnActionsReady", which updates the UI and resets the timeout.
Updating the UI is a no-op in this situation since the window/view
are no longer attached, but the timeout is reset, causing a
timeout log six seconds later.

It doesn't make any sense to try to show UI after dismissal, so we
should just do the same thing we do for the "old" screenshot during
successive screenshots and save silently.

Bug: 262242456
Fix: 262242456
Test: make statsd_testdrive && $ANDROID_HOST_OUT/bin/statsd_testdrive 90
Change-Id: I0de70d839502c7799da8a8b31e69cfbca0955bd4