Suggestions defined in MR would show values from target project when
previewing the commit message. However, once the commit was actually
created, it used values from source project instead. This means that
forks would ignore target project settings. The difference in preview
and result would also confuse users.
This MR changes it, so that suggestions always use target project when
generating the message, both for template definition and project name
and path variables.

Changelog: fixed