Pagination does not reset when switching between milestones

[sv-calin]

Url: https://webcompat.com/issues

Environment:
Operating system: Windows 10
Firefox version: Nightly 104.0a1 (2022-07-13) (64-bit)

Steps to reproduce:

1. Go to https://webcompat.com/issues
2. Select a milestone
3. Click "next" to go to the next page
4. Select a different milestone
5. Check the page number in the address bar

Expected Behavior:
Page number resets when a different milestone is selected.

Actual Behavior:
Page number does not reset to 1, the page number is retained.

Notes:

1. Video provided: https://gifyu.com/image/SKG3Q
2. Reproducible regardless of ETP status
3. Reproducible in Chrome as well

Watchers:
@softvision-oana-arbuzov
@softvision-raul-bucata
@ClintNase