client-sdk/go/crypto: Fix public key comparison for pointer variants

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #1366 (65d2158) into main (8039a75) will decrease coverage by 0.42%.
The diff coverage is 81.48%.

@@            Coverage Diff             @@
##             main    #1366      +/-   ##
==========================================
- Coverage   56.14%   55.73%   -0.42%     
==========================================
  Files         120      124       +4     
  Lines        8522     8654     +132     
==========================================
+ Hits         4785     4823      +38     
- Misses       3700     3789      +89     
- Partials       37       42       +5     

Impacted Files	Coverage Δ
client-sdk/go/crypto/signature/sr25519/sr25519.go	28.07% <72.72%> (ø)
client-sdk/go/crypto/signature/ed25519/ed25519.go	51.72% <87.50%> (ø)
...ent-sdk/go/crypto/signature/secp256k1/secp256k1.go	75.00% <87.50%> (+8.33%)	⬆️

... and 2 files with indirect coverage changes