Update App.ts into chat resource

[MuDzYNN]

No description provided.

[technetium-cfx]

What issue does this fix?

[MuDzYNN]

Example oldMessage array: [“/revive”, “/revive”, “/revive”, “/heal”]
With this simple commit array looks like: [“/revive”, “/heal”], so if you want to search old message by using arrow up key (you want to use /heal command) you don’t need to click it three times