Fix nftables completion: when object name contains its type name

[Mumumu4]

Fix nftables completion: when object name contains its type name, the completion may mass up

E.g.

table inet foo {
        chain my_chain {
                jump my_chain2
        }
        chain my_chain2 {
        }
}

nft delete chain inet foo <tab> get

handle                          -- address chain by handle
my_chain2                       -- (handle 31)
my_chain                        -- (handle 30)
\t\tjump my_chain2 # handle 33

the last line in the completion output is not wanted.

• [x] This compdef is not already available in zsh.
• [x] This compdef is not already available in their original project.
• [ ] I am the original author, or I have authorization to submit this work.
• [x] This is a finished work.
• [x] It has a header containing authors, status and origin of the script.
• [x] It has a license header or I accept that it will be licensed under the terms of the Zsh license.