Remove unneeded this.#signatureData = null; lines in src/core/document.js

[Snuffleupagus]

Given that this is the initial value of the field, setting it again when no signatures exist is pointless.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.40%. Comparing base (5b100c4) to head (20e0d6d).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21536      +/-   ##
==========================================
- Coverage   89.40%   89.40%   -0.01%     
==========================================
  Files         262      262              
  Lines       66762    66760       -2     
==========================================
- Hits        59690    59688       -2     
  Misses       7072     7072              

Flag	Coverage Δ
browsertest	66.53% <ø> (+<0.01%)	⬆️
fonttest	9.05% <ø> (ø)
integrationtest	68.72% <ø> (+<0.01%)	⬆️
unittest	57.32% <ø> (-0.02%)	⬇️
unittestcli	56.30% <ø> (+0.02%)	⬆️

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[timvandermeij]

r=me; thanks!