cryptpad: fix broken symlink that renders cryptpad unusable

This fixes a broken symlink after install; there probably is a better
way to do it but that'll work and ideally new test will catch this
breaking again.

Fixes: #404114

Changed files
+2
pkgs
by-name
cr
cryptpad
+2
pkgs/by-name/cr/cryptpad/package.nix
···
# Move to install directory manually.
npm run install:components
mv www/components "$out_cryptpad/www/"
+
# and fix absolute symlink to /build...
+
ln -Tfs ../../src/tweetnacl "$out_cryptpad/www/components/tweetnacl"
# install OnlyOffice (install-onlyoffice.sh without network)
mkdir -p "$out_cryptpad/www/common/onlyoffice/dist"