Search bar contents not retained after submitting

[leec-666]

NetBox version

v3.1.8

Python version

3.8

Steps to Reproduce

1. Enter a search term into the main search bar and submit
2. See empty search bar

Expected Behavior

1. Enter a search term into the main search bar and submit
2. Search term should still be present

Observed Behavior

1. Enter a search term into the main search bar and submit
2. Search bar is empty

[PieterL75]

I've been wanting to submit a FR for this, but always forgot about it :-)
Maybe a good one to combine with #7839 (set input focus on searchbar )

[PieterL75]

I have a PR for this ready.. @jeremystretch can you assign this to me ?