Extra/Redundant preamble string in compose.inc

[Marcus I. Ryan]

Short version:
The preambleString in compose.inc line 342 needs to be removed.

Long version:
In compose.inc line 342 the call to IMP::flistSelect includes a
preambleString as part of the argument.  However, the function
getSentmailFolder used in line 340 already includes the call to
preambleString, so it has already been appended in its return value. 
When it's added in the flistSelect call, it duplicates the prepend and
flistSelect can't find the right folder.

-- 
Marcus I. Ryan, marcus@riboflavin.net
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 "Love is a snowmobile racing across the tundra and then suddenly it
 flips over, pinning you underneath.  At night, the ice weasels come."
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