The `to_nice_yaml` helper will by default wrap any string YAML values on
the first space after column 80. This can in worst case yield invalid
YAML syntax. More details in Ansible's documentation here:

https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html#formatting-data-yaml-and-json

In short, you need to explicitly provide a custom width argument of a
high number of some kind to avoid the line wrapping.

All of `setup_install.yml` only runs if `matrix_bot_matrix_reminder_bot_enabled`,
so it's not necessary to add that condition once again.

This has been tested and appears to work.