ntfs3: Convert ni_readpage_cmpr() to take a folio

We still use an array of pages for the decompression, but this removes
a few calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>