fix(outline): use new object for symbols.filter (#4006)

## Description
In `outline.nvim` we have `symbols.filter = LazyVim.config.kind_filter`.
`outline.nvim` adds an entry `exclude = false` by default when it's a
table. This entry propagates to `LazyVim.config.kind_filter` and when
using `LazyVim.config.get_kind_filter()` in Telescope `<leader>ss` that
entry is there as well and causes the error in
https://github.com/nvim-telescope/telescope.nvim/blob/bfcc7d5c6f12209139f175e6123a7b7de6d9c18a/lua/telescope/utils.lua#L143.
Use `vim.deepcopy` to create a new object for `symbols.filter` in
`outline.nvim`, so that the additional entries don't propagate to
default `LazyVim.config.kind_filter`.
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## Related Issue(s)
Fixes #4003
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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/editor/outline.lua

@@ -16,7 +16,7 @@ return {
       local opts = {
         symbols = {
           icons = {},
-          filter = LazyVim.config.kind_filter,
+          filter = vim.deepcopy(LazyVim.config.kind_filter),
         },
         keymaps = {
           up_and_jump = "<up>",