The `ApiVersion` type was introduced in commit ba850a25
("api/api-types: refactor api endpoint version, add api types")
including the `repoid`, added for completeness when converting from
a pre-existing `ApiVersionInfo` instance, as returned by the
`version` api endpoint.
Drop the additional `repoid` field, since this is currently not used,
can be obtained fro the `ApiVersionInfo` as well and only hinders the
implementation for easy api version comparison.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>