account: avoid private header
We don't need a private header file. We can just use GDbusProxy as type instead of CloudProvidersDbusAccountProxy
Rebase of !25 (closed) since force pushing doesn't work there.
We don't need a private header file. We can just use GDbusProxy as type instead of CloudProvidersDbusAccountProxy
Rebase of !25 (closed) since force pushing doesn't work there.