Fix GATconv.jittable()

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #4347 (fc6ff70) into master (300f005) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4347   +/-   ##
=======================================
  Coverage   82.26%   82.26%           
=======================================
  Files         310      310           
  Lines       15920    15920           
=======================================
  Hits        13096    13096           
  Misses       2824     2824           

Impacted Files	Coverage Δ
torch_geometric/nn/conv/gat_conv.py	100.00% <ø> (ø)
torch_geometric/nn/conv/message_passing.py	99.37% <100.00%> (ø)

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