bug#70125: `guix home import` doesn't quote aliases properly

[Attila Lendvai]

as reported on #guix on 2024-04-01:

https://logs.guix.gnu.org/guix/2024-04-01.log#121908

the following alias (a default in ubuntu) is not quoted properly:

notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" 
"$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"

which leads to an error when opening a new terminal after a `guix home 
reconfigure`.

a discussion of this alias:

https://askubuntu.com/questions/423646/use-of-default-alias-alert

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