style: Renamed variables to avoid built-in names

[frgfm]

This PR renames several variables that were flagged as built-in names.

[codecov]

Codecov Report

Merging #73 (81bc1bf) into main (d8f0d68) will not change coverage.
The diff coverage is 99.13%.

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   92.95%   92.95%           
=======================================
  Files          10       10           
  Lines         667      667           
=======================================
  Hits          620      620           
  Misses         47       47           

Impacted Files	Coverage Δ
torchscan/modules/receptive.py	83.78% <87.50%> (ø)
torchscan/crawler.py	84.32% <100.00%> (ø)
torchscan/modules/flops.py	97.51% <100.00%> (ø)
torchscan/modules/macs.py	100.00% <100.00%> (ø)
torchscan/modules/memory.py	100.00% <100.00%> (ø)