Use file extensions even more as a heuristic.

If a file type has a list of "typical" extensions, and a file has an
extension that is *not* one of those extensions, the file is unlikely to
be of that type.

For files that have extensions, after we try the heuristics that have a
list of "typical" extensions that includes the file's extension, try the
heuristics that have no such list, and after that try the heuristics
that have such a list but where the list *doesn't* include the file's
extension.

This fixes, for example, some cases where non-PacketLogger files were
getting identified as PacketLogger files.

Change-Id: I2d8c3b983ed6ccd692beb888668f77eb9b5f437b
Reviewed-on: https://code.wireshark.org/review/7315
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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