Use ownerDisplayName for SharingEntry Tooltip

Some NC installations may use a LDAP UUID for the username. If that
is the case, then the tooltip for who a file/folder was shared by may say something
like `Shared with Steve McQueen (smqueen@yada.com) by FKDJ39-38D794JG-4398GJODF9H3G-4534`.

This commit changes the value showed for the owner to the full display name.

Signed-off-by: npmbuildbot-nextcloud[bot] <npmbuildbot-nextcloud[bot]@users.noreply.github.com>