fix(luasnip): correctly remove duplicate snippets (#5214)

## Description
Remove `snippets` from `opts.sources.default` when Luasnip is enabled to
not get duplicate snippets.
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maintainers
  why we should accept this pull request. -->

## Related Issue(s)
Fixes #5210
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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/coding/luasnip.lua

@@ -68,7 +68,6 @@ return {
     "saghen/blink.cmp",
     optional = true,
     opts = {
-      sources = { default = { "luasnip" } },
       snippets = {
         expand = function(snippet)
           require("luasnip").lsp_expand(snippet)
@@ -85,4 +84,16 @@ return {
       },
     },
   },
+
+  -- Luasnip sources for blink
+  {
+    "saghen/blink.cmp",
+    optional = true,
+    opts = function(_, opts)
+      table.insert(opts.sources.default, "luasnip")
+      opts.sources.default = vim.tbl_filter(function(p)
+        return p ~= "snippets"
+      end, opts.sources.default)
+    end,
+  },
 }