LL-5718 Fix Stealthcoin explorer URL

[MortalKastor]

Context: https://ledgerhq.atlassian.net/browse/LL-5718

[codecov]

Codecov Report

Merging #643 (777e763) into master (031cf51) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #643   +/-   ##
=======================================
  Coverage   40.93%   40.93%           
=======================================
  Files          74       74           
  Lines        4397     4397           
  Branches      720      720           
=======================================
  Hits         1800     1800           
  Misses       2580     2580           
  Partials       17       17           

Impacted Files	Coverage Δ
packages/cryptoassets/src/currencies.ts	100.00% <ø> (ø)

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