When unsharing from self in a group share situation, the share items
passed to the post_unshareFromSelf hook were using the wrong format in
which the attribute names (ex: "share_type") have non camel-case format.
This fix makes sure that in group sharing case we use the correct
format. It looks like the code was already producing it but in
array_merge it was not using it and adding the unprocessed one.
This adds the "QUICKDB" group which excludes some tests that abuse unit tests as integration tests as displayed in https://github.com/nextcloud/server/issues/1626
Signed-off-by: Lukas Reschke <lukas@statuscode.ch>