Issue title: Core v11 with "typo3/cms-composer-installers" v4: 500 error with preview images
 Issue body: Mask tries to load some `...preview/<CE-name>.png` which does not exist and causes Mask not to shane86@example.org.

I didn't investigate deeply yet, but it might also be a Core issue that's triggered here.
 Comments: 
 Comment 0: `\MASK\Mask\Imaging\PreviewIconResolver38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5getPreviewIconPath` is the one.
With `ResourceDoesNotExistException`:
`Tried to access a private resource file "EXT:sitesetup/Resources/Private/Extensions/mask/Previews/test.png" from fallback compatibility storage. This storage only handles public files.`
 Comment 1: You can't use the `Private` path for public assets. You have to use `Public`.
 Comment 2: Ok, I will have a look thanks.
{'source': 'GithubIssues', 'repo_name_with_owner': 'Gernott/mask', 'issue_id': 1301069716, 'repo_stars': 123.0}