Revert "EIP5169 files from IPFS are intrinsically signed"

[seabornlee]

Reverts #2792

[github-actions]

Pull reviewers stats

Stats of the last 30 days for alpha-wallet-android:

	User	Total reviews	Time to review	Total comments
	JamesSmartCell 🥇	8 ▀▀▀▀▀	23h 11m ▀▀▀	13 ▀▀▀▀▀▀▀
	seabornlee 🥈	7 ▀▀▀▀	2h 19m	7 ▀▀▀▀
	justindg 🥉	1 ▀	1d 19h 5m ▀▀▀▀▀▀	0

[codecov]

Codecov Report

Base: 7.41% // Head: 7.41% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (aed3188) compared to base (5746c1e).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head aed3188 differs from pull request most recent head 308be17. Consider uploading reports for the commit 308be17 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##             master   #2795   +/-   ##
========================================
  Coverage      7.41%   7.41%           
  Complexity      779     779           
========================================
  Files           575     575           
  Lines         40601   40585   -16     
  Branches       4133    4131    -2     
========================================
  Hits           3011    3011           
+ Misses        37334   37318   -16     
  Partials        256     256           

Impacted Files	Coverage Δ
...lphawallet/app/service/AssetDefinitionService.java	6.08% <0.00%> (+0.07%)	⬆️

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