Fix bigquery table google_sheets_options

[chrisst]

The at least one of validation has been changed to actually allow at least one
of the options.

fixes hashicorp/terraform-provider-google#5645

Release Note Template for Downstream PRs (will be copied)

bigquery: Fixed the `google_sheets_options` at least one of logic.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 88 insertions(+), 6 deletions(-))
Terraform Beta: Diff ( 2 files changed, 88 insertions(+), 6 deletions(-))