Fix AttentionExplainer for AttentiveFP

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #8244 (2e1c1cc) into master (114ddca) will decrease coverage by 0.69%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #8244      +/-   ##
==========================================
- Coverage   88.09%   87.40%   -0.69%     
==========================================
  Files         473      473              
  Lines       28635    28634       -1     
==========================================
- Hits        25225    25028     -197     
- Misses       3410     3606     +196     

Files	Coverage Δ
...geometric/explain/algorithm/attention_explainer.py	93.22% <100.00%> (+1.69%)	⬆️
torch_geometric/nn/models/attentive_fp.py	96.00% <100.00%> (-4.00%)	⬇️

... and 36 files with indirect coverage changes

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