Seed encrypt: init mint with encrypted keys after migration

[callebtc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 68.63%. Comparing base (752ab3c) to head (c960b09).

Files	Patch %	Lines
cashu/mint/encrypt.py	0.00%	3 Missing ⚠️
cashu/mint/ledger.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #472      +/-   ##
==========================================
- Coverage   68.68%   68.63%   -0.05%     
==========================================
  Files          74       74              
  Lines        6664     6670       +6     
==========================================
+ Hits         4577     4578       +1     
- Misses       2087     2092       +5     

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