fix sampling handling of dscr region

[ChuckHastings]

Bug was discovered in how the sampling code is looking up DCSR offset.

[codecov-commenter]

Codecov Report

Merging #2321 (0e66741) into branch-22.06 (38be932) will decrease coverage by 8.19%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           branch-22.06    #2321      +/-   ##
================================================
- Coverage         70.82%   62.63%   -8.20%     
================================================
  Files               170      104      -66     
  Lines             11036     4750    -6286     
================================================
- Hits               7816     2975    -4841     
+ Misses             3220     1775    -1445     

Impacted Files	Coverage Δ
python/cugraph/cugraph/__init__.py	100.00% <ø> (ø)
python/cugraph/cugraph/centrality/__init__.py	100.00% <ø> (ø)
...graph/cugraph/centrality/betweenness_centrality.py	89.65% <ø> (ø)
...on/cugraph/cugraph/centrality/degree_centrality.py	81.81% <ø> (ø)
...thon/cugraph/cugraph/centrality/katz_centrality.py	89.79% <ø> (+0.32%)	⬆️
python/cugraph/cugraph/community/egonet.py	97.36% <ø> (ø)
...ython/cugraph/cugraph/community/ktruss_subgraph.py	88.23% <ø> (+2.94%)	⬆️
python/cugraph/cugraph/community/leiden.py	100.00% <ø> (+7.69%)	⬆️
python/cugraph/cugraph/community/louvain.py	100.00% <ø> (+7.69%)	⬆️
python/cugraph/cugraph/community/triangle_count.py	100.00% <ø> (+11.11%)	⬆️
... and 139 more

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[ChuckHastings]

@gpucibot merge