Send close system dialogs for current user

It has been reported that the Escape key will not properly close
some system dialogs when in HSUM; the current way to call it will
send it as the system user instead of the current one, so this CL
addresses this.

Bug: 385008668
Test: Manual
Flag: EXEMPT bugfix
Change-Id: I6215dccdfe2c79d30854ad59e62ad0848081006d