fix rendering of figma branch name in issue template

Purpose

Prevent Figma branch name incorrectly referencing issue #120 (closed) in the illustration issue template

Uses same approach found in the icon issue template.

Screenshots

Before After
Screenshot_2023-02-28_at_17.15.16 Screenshot_2023-02-28_at_17.18.51

Checklist

For a new icon and/or illustration:

For third-party trademarks:

Merge request reports

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