fix: p2sh address from script

[ghost]

Reference: https://github.com/BP-WG/bp-core/blob/master/consensus/src/script.rs#L143-L148

the p2sh script length is 23, skip first 2 bytes, there remain 21 bytes, it will panic

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 36.8%. Comparing base (82a9b01) to head (ebb1209).
Report is 2 commits behind head on master.

Files	Patch %	Lines
invoice/src/address.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #37   +/-   ##
======================================
  Coverage    36.8%   36.8%           
======================================
  Files          24      24           
  Lines        4153    4153           
======================================
  Hits         1528    1528           
  Misses       2625    2625           

Flag	Coverage Δ
rust	36.8% <0.0%> (ø)

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[dr-orlovsky]

ACK ebb1209