Fix dispatcher in hetero_neighbor_sample

[rusty1s]

No description provided.

[codecov-commenter]

Codecov Report

Merging #125 (451e3c0) into master (72bc537) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
+ Coverage   93.76%   94.00%   +0.24%     
==========================================
  Files          20       20              
  Lines         513      534      +21     
==========================================
+ Hits          481      502      +21     
  Misses         32       32              

Impacted Files	Coverage Δ
pyg_lib/csrc/ops/matmul.cpp	100.00% <100.00%> (ø)
pyg_lib/csrc/sampler/cpu/neighbor_kernel.cpp	86.55% <100.00%> (ø)
pyg_lib/csrc/sampler/neighbor.cpp	100.00% <100.00%> (ø)
pyg_lib/csrc/utils/check.cpp	100.00% <100.00%> (ø)

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