#878 In "nested view" change group icon colour to indicate expired password therein

[Mitch Ames]

I normally use "nested tree" view because I have many entries in the database. Some entries in those groups have expiry dates. If I expand the tree to see the entry, the icon is red to indicate an expired password, but if don't expand the tree, I can't see that an entry in the group has expired. (I could enable "Warn n days before passwords expire" but I don't like it nagging me - I'd rather just see the red icons.)

Could we please have the group icon show as red if at least one entry in that group (or a subgroup thereof) has an expired password.