Patch: Closed-Date is reset when changing from one "closed" state to another "closed" state.

[Dieperink Alwin]

Hello,

According to the text in the "gnats-adm/states" file, the Closed-Date should
not change when changing the PR from a "closed" state to another "closed"
state. I think this was also the behaviour of Gnats 3.113.

In the latest version, the Closed-Date is emptied when a new "closed" state
is chosen.

This patch should correct the problem, with following rules:
- The Closed-Date will always be set when the state is "closed" but only if
the previous state was not "closed" or if the Closed-Date is empty. 
- The Closed-Date will be reset only if the new state is not "closed".

Regards
-- Alwin


 <<dbconfig.in.patch>>

dbconfig.in.patch
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