segtree: don't trigger error on exact overlaps

So adding the same element doesn't trigger any error:

 # nft add element filter bogons { 3.3.3.123/24 }
 # nft add element filter bogons { 3.3.3.123/24 }

Still kernel reports an error if we use create instead:

 # nft create element filter bogons { 3.3.3.123/24 }
 <cmdline>:1:1-46: Error: Could not process rule: File exists
 create element filter bogons { 3.3.3.123/24 }
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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