[Mutt] #3029: progress percentage goes negative for large message (>22M)

[Mutt <fleas@xxxxxxxx>]

#3029: progress percentage goes negative for large message (>22M)

 When downloading large messages from an IMAP server, the progress
 percentage goes negative when the message size exceeds 22Mb (2**31 /100
 bytes). This problem does not affect 64-bit versions.

 A simle fix in curs_lib.c using float is attached.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3029>