Does not change from `vendor/` to `type:wordpress-plugin` path

```yml
"require": {
"composer/installers": "^2.2",
"benbodhi/svg-support": "2.5.6",
},

"repositories": {
"wpackagist": {
"type": "composer",
"url": "https://wpackagist.org",
"only": [
"wpackagist-plugin/*",
"wpackagist-theme/*"
]
},

"svg-support-repository": {
"type": "package",
"package": {
"name": "benbodhi/svg-support",
"type": "wordpress-plugin",
"version": "2.5.6",
"source": {
"url": "https://plugins.svn.wordpress.org/svg-support/",
"type": "svn",
"reference": "tags/2.5.6"
}
}
}
},

"extra": {
"installer-paths": {
"web/app/plugins/{$name}/": [
"type:wordpress-plugin"
]
}
},
````

When `"type": "wordpress-plugin"` was missing on a previous `composer update` run, the plugin files end up in `vendor/`.
After `"type": "wordpress-plugin"` was added, and `composer update` ran again, the
plugin files will be still in `vendor/` and missing in `web/app/plugins/svg-support`.
Only a manual fix/workaround, by removing the directory in `vendor/` and re-running `composer update`
lets `composer update`; `composer install` put the plugin files into `web/app/plugins/svg-support/` directory.