user administration: reset pagination in user list when search filter changes.

[stopfstedt]

noticed this as a problem while reviewing ilios/frontend#8037

to reproduce:

1. log into demo as dev
2. go to administration > all users
3. use he navigation to go 5 pages deep, along the way take note of the "Adams" last name in the first couple of pages of users ¹
4. apply "adams" in the user search
5. observe that you end up on a page without results ². this is incorrect, the offset should have reset to 0 and the user should be on the first page of filtered users.

Footnotes

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[michaelchadwick]

I noticed that when I was testing this page, too. A new search needs to remove the offset value in the query string.