Remove duplication in pagination

[artek-koltun]

No description provided.

[codecov]

Codecov Report

Merging #383 (5996f44) into main (7f4e06d) will decrease coverage by 3.16%.
The diff coverage is 82.69%.

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
- Coverage   81.07%   77.91%   -3.16%     
==========================================
  Files          16       18       +2     
  Lines        2219     2314      +95     
==========================================
+ Hits         1799     1803       +4     
- Misses        379      468      +89     
- Partials       41       43       +2     

Impacted Files	Coverage Δ
pkg/frontend/scsi.go	0.00% <0.00%> (ø)
pkg/server/utils.go	0.00% <ø> (ø)
pkg/frontend/nvme.go	88.46% <69.23%> (-1.06%)	⬇️
pkg/server/pagination.go	94.91% <94.91%> (ø)
pkg/backend/aio.go	95.60% <100.00%> (-0.15%)	⬇️
pkg/backend/backend.go	100.00% <100.00%> (ø)
pkg/backend/null.go	95.60% <100.00%> (-0.15%)	⬇️
pkg/backend/nvme.go	92.53% <100.00%> (-0.32%)	⬇️
pkg/frontend/blk.go	89.68% <100.00%> (-0.55%)	⬇️
pkg/frontend/frontend.go	69.56% <100.00%> (ø)
... and 3 more

[glimchb]

not ignoring this, I think there is a better option, let me try to present it in slack and we can discuss...