fix(dgrid-shim): max page when pagination counts are unknown

[jeclrsg]

previous fix shouldn't have relied on comparing the text to the total, but should have ensured the link text is a number

Checklist:

• [x] The commit message is properly formatted and free of typos.
  • [ ] The commit message title makes sense in a changelog, by itself.
  • [ ] The commit message includes a "fixes" reference if appropriate.
  • [x] The commit is signed.
• [x] The change has been fully tested:
  • [ ] I have viewed all related gallery items
  • [ ] I have viewed all related dermatology items
• [x] There are no similar instances of the same problem that should be addressed
  • [ ] I have addressed them here
  • [ ] I have raised new issues to address them separately

Testing: