[imp] imp custom headers fix patch

[Jan Schneider]

Zitat von Vijay Mahrra <vijay.mahrra at es.easynet.net>:

> there was a bug in the imp custom headers patch i sent.
>
> viewing all headers for a message would still execute the code to
> display the user-specified headers, i.e. some headers get repeated
> twice.

Committed, thanks.

Jan.

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