refactor: remove count from spare share splitter

[rootulp]

Closes https://github.com/celestiaorg/celestia-app/issues/873 Closes https://github.com/informalsystems/audit-celestia/issues/20

[codecov-commenter]

Codecov Report

Merging #911 (d7eb44c) into main (457a207) will increase coverage by 0.00%. The diff coverage is 25.00%.

@@           Coverage Diff           @@
##             main     #911   +/-   ##
=======================================
  Coverage   26.09%   26.09%           
=======================================
  Files          77       77           
  Lines        9344     9341    -3     
=======================================
  Hits         2438     2438           
+ Misses       6677     6674    -3     
  Partials      229      229           

Impacted Files	Coverage Δ
pkg/shares/split_sparse_shares.go	70.00% <25.00%> (+2.03%)	:arrow_up:

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