Fix handling of template.visibility

[aaronskiba]

Fixes #3419

Changes proposed in this PR:

• app/views/org_admin/templates/_show.html.erb

  • Prior to this commit, if template.visibility == 'organisationally_visible', would always evaluate to false. This is because template.visibility returns an integer value.

• app/views/org_admin/templates/_form.html.erb

  • f.object.visibility == 'organisationally_visible' always evaluates to false. Thus, prior to this commit, the checkbox would always initially render as unchecked.
  • Also, prior to this commit, the default checked/unchecked values were used (i.e. "1" would be returned when checked, and "0" would be returned when unchecked), and the box is meant to be checked when selecting 'organisationally_visible' ('for internal %{org_name} use only'), which makes the default checked/unchecked values opposite to the mapping of our enums (i.e. {"organisationally_visible"=>0, "publicly_visible"=>1}).

[github-actions[bot]]

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:no_entry_sign:	Please include a CHANGELOG entry. You can find it at [CHANGELOG.md](https://github.com/DMPRoadmap/roadmap/blob/main/CHANGELOG.md).

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[aaronskiba]

Closing this because the behaviour of Template.visibility will change with the upgrade to Rails 7. The changes within this PR have been adapted to the following PR: https://github.com/DMPRoadmap/roadmap/pull/3435.