sstableloader: fix misidentification of cql row delete as column delete
sstableloader: fix misidentification of cql row delete as column delete

If the size of a range tombstone component is the same or smaller than a
clustering key, then this is a row delete, but the code got this backwards.

Fixes #11.
Message-Id: <84c89413949e9b32948a1942a2f908f3bf149f20@scylladb.com>

scylladb/scylla-tools-java,scylladb/scylla-tools-java,scylladb/scylla-tools-java,scylladb/scylla-tools-java