Fix: num_nodes in FixedPoints transform

[rusty1s]

Fixes #4387

[codecov]

Codecov Report

Merging #4394 (dbde5ee) into master (36a80d7) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4394      +/-   ##
==========================================
- Coverage   82.68%   82.56%   -0.12%     
==========================================
  Files         311      311              
  Lines       16084    16084              
==========================================
- Hits        13299    13280      -19     
- Misses       2785     2804      +19     

Impacted Files	Coverage Δ
torch_geometric/transforms/fixed_points.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/utils/typing.py	81.25% <0.00%> (-17.50%)	⬇️
torch_geometric/io/tu.py	93.58% <0.00%> (-2.57%)	⬇️
torch_geometric/nn/models/mlp.py	98.41% <0.00%> (-1.59%)	⬇️
torch_geometric/transforms/gdc.py	78.17% <0.00%> (-1.02%)	⬇️
torch_geometric/data/dataset.py	96.80% <0.00%> (-0.80%)	⬇️
torch_geometric/nn/conv/rgat_conv.py	83.76% <0.00%> (-0.53%)	⬇️
torch_geometric/graphgym/utils/comp_budget.py	15.51% <0.00%> (+0.51%)	⬆️

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