fix(walletkit): fix custom service provider

[kevzzsk]

What this PR does / why we need it:

Fix custom service provider url not respected. This is probably caused when migration of common code into walletkit

Which issue(s) does this PR fixes?:

Fixes #3906

Additional comments?:

[codecov]

Codecov Report

Base: 68.33% // Head: 65.76% // Decreases project coverage by -2.58% ⚠️

Coverage data is based on head (aca4c9d) compared to base (9c079d2).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
- Coverage   68.33%   65.76%   -2.58%     
==========================================
  Files          20       21       +1     
  Lines         619      663      +44     
  Branches      112      119       +7     
==========================================
+ Hits          423      436      +13     
- Misses        187      218      +31     
  Partials        9        9              

Impacted Files	Coverage Δ
packages/walletkit-core/src/api/whale.ts	100.00% <100.00%> (ø)
...ackages/walletkit-ui/src/contexts/WhaleContext.tsx	94.11% <100.00%> (+0.78%)	⬆️
...walletkit-ui/src/contexts/StoreServiceProvider.tsx	16.21% <0.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.