Fix another AddAccountSettings memory leak

The memory leak will always occur in AddAccoutSettings
when Bundle with an invalid intent returned in the addAccount we implement.

Bug:https://issuetracker.google.com/issues/66088681


Test:Install the app through the github offered in above link,
then press the "Test" item in ChooseAccountActivity (adb shell am start -n
'com.android.settings/.accounts.ChooseAccountActivity') serveal times.
Check the activity number by "adb shell dumpsys meminfo com.android.settings".

Test: CtsAccountManagerTestCases
Change-Id: Id15fc73521d0ddc6ca891b6029ad04cd4427dbfe
Signed-off-by: tiansiming <tiansiming@xiaomi.com>