fix(TaxForms/W9): differenciate org/signer names

[Betree]

Part of opencollective/opencollective#7846

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.74%. Comparing base (b626e5c) to head (20f1c45).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
server/lib/tax-forms/w9.ts	0.00%	2 Missing ⚠️
server/lib/tax-forms/w8-ben-e.ts	0.00%	1 Missing ⚠️
server/routes/tax-forms.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1164      +/-   ##
==========================================
+ Coverage   58.03%   59.74%   +1.70%     
==========================================
  Files          34       35       +1     
  Lines         958     1006      +48     
  Branches      336      342       +6     
==========================================
+ Hits          556      601      +45     
- Misses        334      337       +3     
  Partials       68       68              

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