History viewer table is cropped outside of `CMSMain`

[emteknetnz]

When working on #437 - noticed that the history view table is cropped - note uses code example from description of linked issue.

Note that this is in non-CMSMain sections, e.g. in a model admin's gridfield edit form. It displays correctly for pages in CMSMain.

PRs

• FIX Do not crop history viewer table #443