Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Tom Thorogood <tomthorogood@github.com>

Author: tomthorogood

topics/game-off/index.md

@@ -3,7 +3,6 @@ aliases: github-game-off, githubgameoff, gameoff, ggo12, ggo13, ggo14, ggo15, gg
 related: global-game-jam, ludum-dare, js13kgames
 display_name: Game Off
 created_by: Lee Reilly
-display_name: Game Off
 released: October 25, 2012
 short_description: Game Off is an annual game jam celebrating open source.
 topic: game-off