Fixes #527 history button not working

[trumpet2012]

Description

This PR fixes the history button that gets shown when viewing a historical version of a model so that it correctly links back to the history listing for that object.

Related Issue

#527

Motivation and Context

Fixes a broken link that users expect to work.

How Has This Been Tested?

I tested this by installing it as a development dependency in our django project. I also ran make tests however only the sqlite versions worked since I haven't setup postgres/msql locally.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[tim-schilling]

This looks good! Thank you @trumpet2012 for your patience

[tim-schilling]

I found another way to do this.

We could define a template at templates/admin/change_form_object_tools.html and if the simple_history app is installed before the admin, it allows us to override the template without having to override that block.

However, I think the additional installation requirements are a bit too burdensome.