Fix FastHGTConv to correctly call the value module

[toenshoff]

This fixes a small bug in the new fast_hgt_conv layer, which incorrectly called the module self.k_rel instead of self.v_rel to generate the value vectors v.

[rusty1s]

:(

[codecov]

Codecov Report

Merging #7050 (a4b7971) into master (0e439f3) will not change coverage.
The diff coverage is 100.00%.

❗ Current head a4b7971 differs from pull request most recent head 825319e. Consider uploading reports for the commit 825319e to get more accurate results

@@           Coverage Diff           @@
##           master    #7050   +/-   ##
=======================================
  Coverage   91.52%   91.52%           
=======================================
  Files         436      436           
  Lines       23837    23837           
=======================================
  Hits        21818    21818           
  Misses       2019     2019           

Impacted Files	Coverage Δ
torch_geometric/nn/conv/fast_hgt_conv.py	96.35% <100.00%> (ø)

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