msi: Fix bug in handling of multivolume CAB files.

[Ove Kaaven]

MSI has a flaw when installing from multiple .cab files. With a CAB set 
of something like:

multi1.cab
multi2.cab
  multivolume cab, contains small.txt and large.bin
single.cab
  singlevolume cab, contains data.txt

Extracting the small.txt from multi*.cab results in cabinet 
notifications of:

fdintCABINET_INFO etc
fdintCOPY_FILE
fdintNEXT_CABINET
  (here, cabinet_notify sets is_continuous = TRUE)
fdintCLOSE_FILE_INFO

Next, attempting to extract data.txt from single.cab hits the "if 
(is_continuous) return" condition in ready_media. As a result, 
information about single.cab is not loaded, and MSI tries to extract 
data.txt from multi2.cab, which fails.

This patch ought to fix this, by clearing is_continuous in the 
CLOSE_FILE_INFO handler.
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