add default visible bool query variable to listing repos

[davidbloss]

Issues

Changelog

Listing repositories only worked when providing query variables (like we have in cli, but missing from terraform provider). This adds a default value so query variables become optional again.

• [X] List your changes here
• [X] Make a changie entry

Tophatting

task test - tests pass

Tested this downstream with Terraform provider

data "opslevel_repositories" "all" {}

output "all" {
  value = data.opslevel_repositories.all
}

Then ran terraform plan which listed all the repos.