fix(php): php_cs_fixer is the correct name (#3991)

## Description
`conform.nvim` was not using the correct formatter name for
`php-cs-fixer` (which is the name of the binary).
Also move `conform.nvim` spec outside of `nvim-lint` spec.
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  why we should accept this pull request. -->

## Related Issue(s)
Fixes #3985
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  If this PR fixes any issues, please link to the issue here.
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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/lang/php.lua

@@ -74,13 +74,13 @@ return {
         php = { "phpcs" },
       },
     },
-    {
-      "stevearc/conform.nvim",
-      optional = true,
-      opts = {
-        formatters_by_ft = {
-          php = { "php-cs-fixer" },
-        },
+  },
+  {
+    "stevearc/conform.nvim",
+    optional = true,
+    opts = {
+      formatters_by_ft = {
+        php = { "php_cs_fixer" },
       },
     },
   },