Fixes #22401
In the fix for scylladb/scylla-enterprise#892, the extraction and check for sstable component encryption mask was copied
to a subroutine for description purposes, but a very important 1 << <value> shift was somehow
left on the floor.
Without this, the check for whether we actually contain a component encrypted can be wholly
broken for some components.
Closes scylladb/scylladb#22398
(cherry picked from commit 7db14420b7)
Closes scylladb/scylladb#22599