fix(internal): fix self-signed detection with scopes (#1096)
fix(internal): fix self-signed detection with scopes (#1096)

Removed the requirement on length of scopes passed. Checking the EnableJwtWithScope internal option should be sufficient since it will only be passed with our generated clients that will always include at least the platform scope and a default audience.
Fixes: #1092
googleapis/google-api-go-client,googleapis/google-api-go-client,google/google-api-go-client,google/google-api-go-client