refactor(blink): color swatch icon upstreamed (#5141)

## Description

I've upstreamed the block char vs. icon replacement for Tailwind colors
so we shouldn't need this here anymore. I've replaced it by extending
the default blink icons instead, just in case they introduce an icon
which isn't yet covered by Lazy's, it would still show up (unlikely, but
better, no?).

## Related Issue(s)

none

## Screenshots

none

## Checklist

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

lua/lazyvim/plugins/extras/coding/blink.lua

@@ -158,9 +158,7 @@ return {
     "saghen/blink.cmp",
     opts = function(_, opts)
       opts.appearance = opts.appearance or {}
-      opts.appearance.kind_icons = vim.tbl_extend("keep", {
-        Color = "██", -- Use block instead of icon for color items to make swatches more usable
-      }, LazyVim.config.icons.kinds)
+      opts.appearance.kind_icons = vim.tbl_extend("force", opts.appearance.kind_icons or {}, LazyVim.config.icons.kinds)
     end,
   },