Require Islandora using its drupal namespace.

[rosiel]

What does this Pull Request do?

Solves the duplicate namespace problem encountered when Islandora Starter Site requires drupal/islandora but this repo requires islandora/islandora

• Related GitHub Issue: n/a

• Other Relevant Links: Add Mirador display for Paged Content. Islandora-Devops/islandora-starter-site#113

What's new?

Changes namespace of required islandora module from islandora to drupal.

How should this be tested?

Load the Starter site. Use composer show to see that you have both islandora/islandora_mirador and drupal/islandora_mirador competing to write code to the same folder.

When requiring this version of Mirador, you should no longer have islandora/islandora but instead only drupal/islandora.

Documentation Status

• Does this change existing behaviour that's currently documented? no
• Does this change require new pages or sections of documentation? no
• Who does this need to be documented for? no
• Associated documentation pull request(s): ___ or documentation issue ___

Additional Notes:

Any additional information that you think would be helpful when reviewing this
PR.

Interested parties

Tag @alxp