Update approved open licenses link

[ricardomiron]

Fixes: Link to approved open licenses was not valid anymore due to changes in the directory.

Changes proposed in this pull request:

• Update link to the correct file location.

Propagation of Changes

Identify where of the following the proposed changes need to be propagated, and include the relevant pull request where appropriate:

• [x] The DPGA website contains https://digitalpublicgoods.net/standard/ which needs to be updated manually matching the contents of standard.md.
• [ ] The DPGA website also contains the submission guide which needs to be updated manually.
• [ ] The unicef/publicgoods-candidates repository needs the following to be updated:
  • [ ] the nominee-schema.json
  • [ ] the screening-schema.json
  • [ ] propagate any changes to all encoded nominees and digital public goods.
  • Link to the corresponding pull request: unicef/publicgoods-candidates#
• [ ] The Submission Form through the unicef/publicgoods-submission repository, and its corresponding schema.js
  • Link to the corresponding pull request:
• [x] The Eligibility Form through the unicef/publicgoods-scripts repository, by editing quizQuestions.js
  • Link to the corresponding pull request: https://github.com/DPGAlliance/publicgoods-scripts/pull/136

[nathanbaleeta]

Nice catch @ricardomiron. In future remember to tag a reviewer to approve and merge the requested changes. Thanks.