Fix commands for groups inside class in minitest spec style

[domingo2000]

Motivation

Closes #3516

The minitest spec style commands where not resolved correctly inside classes.

Implementation

Instead of using the label of the test groups use the id because the id contains all the information.

Automated Tests

Added 1 tests with the case to run the tests of just a group.

Manual Tests

Tested against this example

# ./spec/some_test.rb
require "minitest/autorun"

class SomeTest < Minitest::Spec
  describe "foo" do
    it "bar" do
      assert true
    end
  end
end

And works fine.

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[vinistock]

Nice. Thank you, Domingo!