Manually tested the patch provided in #75 with the steps from issue summary.
...

Manually tested the patch provided in #75 with the steps from issue summary.

Loged in as administrator
Install admin_toolbar_tools
checked home page and check headers
Applied the patch cleared cache
Checked home page and check headers

Test results for 9.3
Pass - Correct header is applied

Test results for 9.4
Pass - Correct header is applied