Fix tests in Drupal 10.2

[rosiel]

GitHub Issue: #989

• Other Relevant Links (Google Groups discussion, related pull requests,
  Release pull requests, etc.)

What does this Pull Request do?

Alters the submit button name to hopefully make tests pass in Drupal 10.2 including dev versions.

What's new?

So far: changed the value of the submit button.

• Changes x feature to such that y
• Added x
• Removed y
• Does this change add any new dependencies?
• Does this change require any other modifications to be made to the repository
  (i.e. Regeneration activity, etc.)?
• Could this change impact execution of existing code?

How should this be tested?

If tests pass on 10.2 and below, this is a success.

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? n/a
• 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

[rosiel]

Tests aren't running, which defeats the one purpose of opening this PR. Will close and try again.