bash: Add missing 'ignoreboth' to historyControl allowed values

[RoadRoller01]

reference: https://www.gnu.org/software/bash/manual/html_node/Bash-Variables.html#index-HISTCONTROL

Description

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• [ofc(:] Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

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Maintainer CC

[rycee]

Thanks! Merged to master now 🙂