account_edit.php: fix missing variable
account_edit.php: fix missing variable

The `admin_id` variable was not defined, which was causing the
closing history to be improperly displayed (it would say that
all actions were taken by "System" instead of an admin name).

hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr,smrealms/smr,hemberger/smr,smrealms/smr