fix(copilot-native): change Copilot-native's <M-[> description to "Prev Suggestion" (#6553)

## Description

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maintainers
  why we should accept this pull request. -->
The description for both `<M-]>` and `<M-[>` in the `copilot-native`
extra are described as `Next Copilot Suggestion`. The PR changes the
description of `<M-[>` to be `Prev Copilot Suggestion`

## Related Issue(s)

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  If this PR fixes any issues, please link to the issue here.
  - Fixes #<issue_number>
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## Screenshots

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## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/extras/ai/copilot-native.lua

@@ -37,7 +37,7 @@ return {
             {
               "<M-[>",
               function() vim.lsp.inline_completion.select({ count = -1 }) end,
-              desc = "Next Copilot Suggestion",
+              desc = "Prev Copilot Suggestion",
               mode = { "i", "n" },
             },
           },