Allow to pass in more options to Policy within filepicker_field

I want to set up `data-fp-store-path` and also set the Policy `path`.
To do this, I added `:security` to filepicker_field, which is then passed to `Policy`

This is how I call it:

```haml
= f.filepicker_field :filepicker_url, |
                    'data-fp-store-location' => 'S3', |
                    'data-fp-store-path' => "temporary-uploads/account/#{current_tenant.id}/", |
                    security: { path: "\\Atemporary-uploads\\/account\\/#{current_tenant.id}\\/.*" } |
```