Does not detect blocks where all resource names contain format verbs

[gdavison]

In Go source files, a heuristic is used to identify if a block looks like Terraform before running tooling against it. It currently requires at least one line matching a resource or data source block or variable or output block.

In most cases this works, but if a reusable Terraform segment allows all names to be replaced, it is not detected. For example, the following is not detected:

func testAccAvailableAZsNoOptInConfigWithProvider(name, provider string) string {
	return fmt.Sprintf(`
data "aws_availability_zones" "%[1]s" {
  provider = %[2]s

  state = "available"

  filter {
    name   = "opt-in-status"
    values = ["opt-in-not-required"]
  }
}
`, name, provider)
}

When format verbs are enabled, the pattern matching should also match resource names contains format verbs.

[gdavison]

This error only exists in #44, fixing it there