TYPO3 v13: capabilities of storage record and driver are not merged correctly.

[siwa-tkapplmueller]

When merging the capabilities, the driver's capabilities were always added to the configuration's capabilities. As a result of that, it was not possible to create a S3 storage that is not public.

I created a PR that should resolve this issue: #180

[cweiske]

The same problem occurs with the "Is writable?" flag. Even when setting the storage record to "non writable", it's shown as writable in the file tree.