mutation_partition: deletable_row::apply(shadowable_tombstone): remove redundant maybe_shadow()
mutation_partition: deletable_row::apply(shadowable_tombstone): remove redundant maybe_shadow()

Shadowing is already checked by the underlying row_tombstone::apply().
This redundant check was introduced by a previous fix to #9483
(6a76e127683355e4d621dfd4905231884b36f7be). The rest of that patch is
good.

Refs: #9483
Signed-off-by: Botond Dénes <a584fa4d75a0a85d721f44fb6e06315a2853b0b6@scylladb.com>
Message-Id: <20211115091513.181233-1-a584fa4d75a0a85d721f44fb6e06315a2853b0b6@scylladb.com>

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