Allow to apply issue inherited templates using URL

What does this MR do?

Fixes a bug where inherited issue templates were not being applied when parameters were present on URL.

Consider feature a template set at instance level, using the URL https://gitlab.com/gitlab-org/gitlab/-/issues/new?issuable_template=feature to create an issue was not applying the description template before this patch.

Found this bug while working on #299084 (closed).