Fix the signature of a VcxApi implementation method

[raphaelguye]

Fixing the signature of the implementation to match the one from the header to avoid a crash when calling the function.

VcxAPI.h:

VcxAPI.m:

[codecov-commenter]

Codecov Report

Merging #748 (cf026ee) into main (66ee076) will decrease coverage by 24.53%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #748       +/-   ##
===========================================
- Coverage   54.73%   30.20%   -24.53%     
===========================================
  Files         363      361        -2     
  Lines       37122    30713     -6409     
  Branches     8089     6305     -1784     
===========================================
- Hits        20317     9276    -11041     
- Misses      10832    18684     +7852     
+ Partials     5973     2753     -3220     

Flag	Coverage Δ
unittests-aries-vcx	30.20% <ø> (-24.43%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tocols/proof_presentation/prover/states/initial.rs	0.00% <0.00%> (-100.00%)	⬇️
...cols/proof_presentation/verifier/states/initial.rs	0.00% <0.00%> (-100.00%)	⬇️
aries_vcx/src/handlers/discovery/mod.rs	0.00% <0.00%> (-93.94%)	⬇️
aries_vcx/tests/utils/scenarios.rs	0.00% <0.00%> (-80.47%)	⬇️
libvdrtools/src/domain/ledger/request.rs	0.00% <0.00%> (-79.49%)	⬇️
aries_vcx/src/utils/provision.rs	0.00% <0.00%> (-77.78%)	⬇️
...ies_vcx/src/core/profile/modular_wallet_profile.rs	0.00% <0.00%> (-76.48%)	⬇️
aries_vcx/src/plugins/anoncreds/indy_anoncreds.rs	2.70% <0.00%> (-75.68%)	⬇️
libvdrtools/src/services/pool/networker.rs	0.00% <0.00%> (-75.11%)	⬇️
...rtools/src/domain/anoncreds/revocation_registry.rs	0.00% <0.00%> (-75.00%)	⬇️
... and 228 more

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