TheiaBackendModelServerClientV2.edit() does not work with CompoundCommand

[kubomann]

TheiaModelServerClientV2.edit() worked if I set the SetCommand as an argument.
However, it didn't work if I included SetCommand in CompoundCommand and set CompoundCommand as an argument.

TheiaBackendModelServerClientV2.edit() is currently implemented as follows:

    edit(modeluri: URI, patchOrCommand: PatchOrCommand, format?: Format): Promise<ModelUpdateResult> {
        if (ModelServerCommand.is(patchOrCommand)) {
            return super.edit(modeluri, ensureCommandPrototype(patchOrCommand));
        }
        return super.edit(modeluri, patchOrCommand, format);
    }

The if clause should check for both command types (e.g. like if (ModelServerCommand.is(patchOrCommand) || CompoundCommand.is(patchOrCommand))).

( refs. eclipse-emfcloud/emfcloud#209 )