Use squareSize instead of k or origSquareSize

[rootulp]

Closes #687

Note this doesn't address celestiaorg/celestia-core#853

[codecov-commenter]

Codecov Report

Merging #705 (32421a1) into main (e089c7e) will increase coverage by 0.01%.
The diff coverage is 91.11%.

@@            Coverage Diff             @@
##             main     #705      +/-   ##
==========================================
+ Coverage   42.73%   42.75%   +0.01%     
==========================================
  Files          30       30              
  Lines        3037     3038       +1     
==========================================
+ Hits         1298     1299       +1     
  Misses       1642     1642              
  Partials       97       97              

Impacted Files	Coverage Δ
pkg/inclusion/get_commit.go	0.00% <0.00%> (ø)
pkg/shares/non_interactive_defaults.go	94.82% <85.71%> (ø)
pkg/inclusion/paths.go	100.00% <100.00%> (ø)
pkg/prove/proof.go	83.82% <100.00%> (ø)
pkg/shares/share_merging.go	70.78% <100.00%> (ø)
x/payment/types/payfordata.go	78.78% <100.00%> (ø)
x/payment/types/square_sizes.go	100.00% <100.00%> (ø)
x/payment/types/wirepayfordata.go	66.35% <100.00%> (ø)

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[evan-forbes]

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