Remove TODO from download-polkadot.sh

[RomarQ]

Removes workaround, which is no longer necessary.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch RomarQ-patch-1

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[github-actions]

WASM runtime size check:

Compared to target branch

Moonbase runtime: 2608 KB (no changes) ✅

Moonbeam runtime: 2772 KB (no changes) ✅

Moonriver runtime: 2768 KB (no changes) ✅

Compared to latest release (runtime-3900)

Moonbase runtime: 2608 KB (+248 KB compared to latest release) ⚠️

Moonbeam runtime: 2772 KB (+292 KB compared to latest release) ⚠️

Moonriver runtime: 2768 KB (+288 KB compared to latest release) ⚠️

[github-actions]

Coverage Report

@@                Coverage Diff                @@
##           master   RomarQ-patch-1     +/-   ##
=================================================
  Coverage   74.51%           74.51%   0.00%     
  Files         392              392             
  Lines       95801            95801             
=================================================
  Hits        71385            71385             
  Misses      24416            24416             

Files Changed	Coverage

Coverage generated Fri Sep 12 09:59:07 UTC 2025

[RomarQ]

Can only be merged after upgrading to stable2506.