Remove twig-extensions from buster-backports

[William Desportes <williamdes@wdes.fr>]

Dear Backports team,

I made the package twig-extensions be removed from Debian a lot of 
months ago, could you please also remove it from buster-backports ?

Ref: https://tracker.debian.org/pkg/twig-extensions
Ref: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=980343

Thank you,
William from the phpMyAdmin packaging team

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